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Betz, N. E. (1977). Effects of Immediate Knowledge of Results and Adaptive Testing on Ability Test Performance. Applied Psychological Measurement, 1(2), 259-266.

Betz, N. E., & Weiss, D. J.. (1976). Effects of immediate knowledge of results and adaptive testing on ability test performance (Research Report 76-3). Minneapolis: University of Minnesota, Department of Psychology, Psychometric Methods Program, Computerized Adaptive Testing Laboratory.

Betz, N. E., & Weiss, D. J.. (1975). Empirical and simulation studies of flexilevel ability testing (Research Report 75-3). Minneapolis: Department of Psychology, Psychometric Methods Program.

Betz, N. E., & Weiss, D. J.. (1973). An empirical study of computer-administered two-stage ability testing (Research Report 73-4). Minneapolis: Department of Psychology, Psychometric Methods Program.