Bottenberg, R. A. & Christal, R. E. (1968). An iterative technique for clustering criteria which retains predictive efficiency. The Journal of Experimental Education, 36, 28-34.
Christal, R. E. (1955). Development of the pilot instructor selection battery. (PRL-TM-55-2). Lackland AFB, TX: Personnel Laboratory, Air Force Personnel and Training Research Center.
Christal, R. E. (1955). Comparison of the efficiency of the AFQT and ACQT-CX as devices for screening applicants for aircrew training. (PRL-TM-55-6). Lackland AFB, TX: Personnel Laboratory, Air Force Personnel and Training Research Center.
Christal, R. E. (1960). The use of aptitude tests in the initial classification of air force military personnel. Tri-Services Conference on Job Qualifications Analysis. ACR-41. Washington: Office of Naval Research.
Carpenter, J. B. & Christal, R. E. (1972). A validation of civil service grade authorizations using job analysis data (AFHRL-TR-72-24, AD-754 966). Lackland AFB, TX: Personnel Research Division, Air Force Human Resources Laboratory.
Carpenter, J. B. & Christal, R. E. (1973). Development of a data base for analysis of airmen loss rates (AFHRL-TR-73-37). Lackland AFB, TX: Personnel Research Division, Air Force Human Resources Laboratory.
Christal, R. E. (1960). Occupational analysis: one route to improved selection procedures and better utilization of available talent. Tri-Service Conference on Selection Research. Washington: Office of Naval Research (ACR-60, 49-55).
Christal, R. E. (1962). USAF occupational research projects of tri-service interest. Tri-Service Conference. Washington: Office of Naval Research.
Christal, R. E. (1963). JAN: A technique for analyzing group judgment. (PRL-TDR-63-3, AD-403 813). Lackland AFB, TX: Personnel Research Laboratory, Aerospace Medical Division.
Christal, R. E. (1965). Air Force research bearing on the automation of personnel management functions. Inter-Service Conference on Automating Personnel Functions. Washington: Office of Naval Research (ACR-125, 20-46).
Christal, R. E. (1965). Application to hierarchical grouping and policy-simulation models to problems in personnel management. Invited paper at the 11th annual seminar on Psychology in Management sponsored by the Occupation Research Center, Purdue University.
Christal, R. E. (1970). Applications of hierarchical grouping to job analysis and personnel research. First Annual Meeting of the American Classification Society, Columbus OH.
Christal, R. E. (1971). Stability of consolidated job descriptions based on task inventory survey information. (AFHRL-TR-71-48, AD-734 739). Lackland AFB, TX: Personnel Research Division, Air Force Human Resources Laboratory.
Christal, R. E. (1972). Analysis of racial differences in terms of work assignments, job interest, and felt utilization of talents and training. (AFHRL-TR-72-1, AD-741 758). Lackland AFB, TX: Personnel Research Division, Air Force Human Resources Laboratory.
Christal, R. E. (1973). Determination of relative aptitude requirements using a benchmark scale. Workshop on Sustaining the Volunteer Force. Office of the Assisant Secretary of Defense (M&RA), Washington, D.C.
Christal, R. E. (1974a). Collecting, analyzing, and reporting information describing jobs and occupations. (AFHRL-TR-74-19, AD-774 575). Lackland AFB, TX: Occupational Research Division, Air Force Human Resources Laboratory.
Christal, R. E. (1974b). Combining occupational information with personnel data to resolve manpower management problems. In Clough, D. J., Lewis, C. C. & Oliver, A. L., Manpower Planning Models. London: The English Universities Press, LTD, New York: Crain, Russak, & Co.
Christal, R. E. (1974c). The United States Air Force occupational research project (AFHRL-TR-73-75, AD-774 574). Lackland AFB, TX: Occupational Research Division, Air Force Human Resources Laboratory.
Christal, R. E. (1976). What is the value of aptitude tests?, 36-51. Proceedings of the 18th Annual Conference of the Military Testing Association. Gulf Shores, AL: Military Testing Association. (October)
Christal, R. E. (1978). Studies relating to the utilization of women. Tenth Training and Personnel Technology Conference, Office of the Undersecretary of Defense, Washington D.C.
Christal, R. E. (1979). What is the value of aptitude tests?, 131-145. in Mullins, C. E. & Winn, W. R. (Eds) Criterion development for job performance evaluation: proceedings from symposium 23 and 24 June 1977. (AFHRL-TR-78-85). Brooks AFB, TX: Manpower and Personnel Division, Air Force Human Resources Laboratory.
Christal, R. E. (1989). Estimating the contribution of experimental tests to the Armed Services Vocational Aptitude Battery (ASVAB). (AFHRL-TP-89-30, AD-A216 122). Brooks AFB, TX: Manpower and Personnel Division, Air Force Human Resources Laboratory.
Christal, R. E. (1991). Comparative validities of ASVAB and LAMP tests for logic gates learning. (AL-TR-1991-31). Brooks AFB, TX: Human Resources Directorate, Armstrong Laboratory.
Christal, R. E., Madden, J. M., & Harding, F. D. (1960). Reliability of job evaluation ratings as a function of number of raters and length of job descriptions. (WADD-TN-60-27, AD-251 837). Lackland AFB, TX: Personnel Research Laboratory, Wright Air Development Center.
Christal, R. E., & Madden, J. M. (1960). Effect of degree of familiarity in job evaluation. (WADD-TN-60-257). Lackland AFB, TX: Personnel Research Laboratory, Wright Air Development Center.
Christal, R. E., Payne, D. L., Weissmuller, J. J. & Anderson, N. S. (1982). Learning abilities measurement program. Presented at Annual meeting of the Psychonomic Society, Minneapolis, MN.
Christal, R. E. & Weissmuller, J. J. (1976). New CODAP programs for analyzing task factor information (AFHRL-TR-76-3, AD-A026 121). Lackland AFB, TX: Occupational and Manpower Research Division, Air Force Human Resources Laboratory.
Christal, R. E. & Weissmuller, J. J. (1988). The Job-Task Inventory. In S. Gael (Ed), Job analysis handbook for business, industry, and government. New York: John Wiley & Sons, Inc. (Volume 2, Chapter 9.3, 1036-1050)
Gould, R. B., & Christal, R. E. (1976). VARSEL: variable selection for multi-purpose prediction systems in the absence of external criteria (AFHRL-TR-76-6, AD-A025 328). Lackland AFB, TX: Occupation and Manpower Research Division, Air Force Human Resources Laboratory.
Hazel, J. T., Christal, R. E., & Hoggatt, R. S. (1966). Officer grade requirements project: IV. Development and validation of a policy equation to predict criterion board ratings. (PRL-TR-66-16, AD-659 125). Lackland AFB, TX: Personnel Research Laboratory, Aerospace Medical Division.
Kyllonen, P. C., Tirre, W. C., & Christal, R. E. (1991). Knowledge and processing speed as determinants of associative learning. Journal of Experimental Psychology, General, 120, 89-108.
Madden, J. M., Hazel, J. T., & Christal, R. E. (1964). Worker and supervisor agreement concerning the worker's job description. (PRL-TDR-64-10, AD-443 510). Lackland AFB, TX: Aerospace Medical Division.
Mead, D. F. & Christal, R. E. (1970). Development of a constant standard weight equation for evaluating job difficulty. (AFHRL-TR-70-44, AD-720 255). Lackland AFB, TX: Personnel Research Division, Air Force Human Resources Laboratory.
Morsh, J. E. & Christal, R. E. (1966) Impact of the computer on job analysis in the United States Air Force (PRL-TR-66-19, AD-656 304). Lackland AFB, TX: Personnel Research Laboratory, Aerospace Medical Division.
Morsh, J. E., Madden, J. M. & Christal (1961). Job analysis in the United States Air Force. (WADD-TR-61-113, AD-259 389). Lackland AFB, TX: Personnel Research Laboratory, Wright Air Development Division.
Phalen, W. J. & Christal, R. E. (1973). Comprehensive Occupational Data Analysis Programs (CODAP) Group Membership (GRMBRS/GRPMBR) and Automated Diagramming (DIAGRM) Programs (AFHRL-TR-73-5, AD-767 199). Lackland AFB, TX: Personnel Research Division, Air Force Human Resources Laboratory.
Tupes, E. C., & Christal, R. E. (1958). Stability of personality trait ratings obtained under diverse conditions (WADC-TN-58-61, AD-151 041). Lackland AFB, TX: Personnel Research Laboratory, Wright Air Development Center.
Tupes, E. C. & Christal, R. E. (1961). Recurrent personality factors based on trait ratings. (ASD-TR-61-97 AD-267 778). Lackland AFB, TX: Personnel Research Laboratory, Wright Air Development Division.
Tupes, E. C. & Christal, R. E. (1992). Recurrent personality factors based on trait ratings. Reprint of original technical report in Special Issue on the Five-Factor Model: Issues and Applications, Journal of Personality, 60(2), 225-251.