Bachman, L. (2004). Statistical analyses for language assessment. Cambridge: Cambridge University Press.

Cambell és Fiske (1959). Convergent and discriminant validation by the multitrait-multimethod matrix. Psychological Bulletin, 56(2), 81-105.

Crocker, L., & Algina, J. (2006). Introduction to classical and modern test theory. Mason, OH: Cengage Learning.

Fulcher, G. (2010). Practical Language Testing. London: Hodder Education.

Hemker, T.B. (1996). Unidimensional IRT models for Polytomous Items, with results for Mokken scale analysis. Utrecht University, The Netherlands.

Henning, G. (1987). A guide to language testing: Development, evaluation and research. Cambridge, MA: Newbury House.

Krippendorff, K. (2004). Content analysis: An introduction to its methodology (2nd ed.). Thousand Oaks, CA: Sage.

Nunnally, J. C., & Bernstein, I. H. (1994). Psychometric theory (3rd ed.). New York: McGraw-Hill.

Verhelst, N. D., Glas, C. A. W., & Verstralen, H. H. F. M. (1995). One-parameter logistic model OPLM. Arnhem: CITO.

Wright, B. D., & Linacre, J. M. (1994). Reasonable mean-square fit values. Rasch Measurement Transactions, 8(3), 369-370.