Siegel, S., & Castellan, N. J. (1988). Nonparametric statistics for the behavioral sciences (Second edition.). McGraw-Hill Book Company.

Siegel, Sidney., and N. John Castellan. Nonparametric Statistics for the Behavioral Sciences. Second edition. New York: McGraw-Hill Book Company, 1988.

Siegel, Sidney., and N. John Castellan. Nonparametric Statistics for the Behavioral Sciences. Second edition. McGraw-Hill Book Company, 1988.