Research
Berg, E. A. (1948). A simple objective for measuring flexibility in thinking. Journal of General Psychology, 39, 15-22.
Eling, P., Derckx, K., & Maes, R. (2008). On the historical and conceptual background of the Wisconsin Card Sorting Test. Brain and Cognition, 67, 247-253.
Flashman, L. A., Horner, M. D., Freides, D. (1991). Note on scoring perseveration on the Wisconsin Card Sorting Test. The Clinical Neurologist, 5, 2, 190-194.
Feldstein, S. N., Keller, F. R., Portman, R. E., Durham, R. L., Klebe, K. J., Davis, H. P. (1999). A comparison of computerized and standard versions of the Wisconsin Card Sorting Test. The Clinical Neurologist, 13, 3, 303-313