Armstrong, R. D., Jones, D. H., & Berliner, N.. (1998). Computerized adaptive testing with multiple form structures. In Paper presented at the annual meeting of the Psychometric Society. Urbana, IL.

Armstrong, R. D., Jones, D. H., Koppel, N. B., & Pashley, P. J.. (2004). Computerized adaptive testing with multiple-form structures. Applied Psychological Measurement, 28, 147-164.

Armstrong, R. D., & Jones, D. H.. (1998). Computer adaptive testing – Approaches for item selection and measurement. Rutgers Center for Operations Research, New Brunswick NJ.