1. Birnbaum, A. Some latent trait models and their use in inferring an examinee's ability. In F. M. Lord & M. R. Novick,Statistical theories of mental test scores. Reading, Mass.: Addison-Wesley, 1968. Chapters 17–20.
2. Bock, R. D. Estimating item parameters and latent ability when responses are scored in two or more nominal categories.Psychometrika, 1972,37, 29–51.
3. Bock, R. D. & Lieberman, M. Fitting a response model forn dichotomously scored items.Psychometrika, 1970,35, 179–197.
4. Cramér, H.Mathematical methods of statistics. Princeton, N. J.: Princeton University Press, 1946.
5. Hambleton, R. K. & Rovinelli, R. A FORTRAN IV program for generating examinee response data from logistic test models.Behavioral Science, 1973,18, 74.