Coombs, C.H. (1964). A theory of data. New York : Wiley.
2.
McDonald, R.P. (1979). The structural analysis of multivariate data: A sketch of general theory. Multivariate Behavioral Research , 14, 21-38.
3.
McDonald, R.P. (1982). Linear versus nonlinear models in item response theory. Applied Psychological Measurement, 6, 379-396.
4.
Sympson, J.B. (1978). A model for testing with multidimensional items . In D. J. Weiss (Ed.), Proceedings of the 1977 computerized adaptive testing conference (pp. 82-98). Minneapolis: University of Minnesota, Department of Psychology, Psychometric Methods Program.
