Gaya APA

Siegel, S., Castellan, N, J. (1988). Nonparametric statistics for the behavioral sciences (2nd Ed.). New York: McGraw Hill Book Co..

Gaya MLA

Siegel, Sidney., Castellan, N., John. "Nonparametric statistics for the behavioral sciences". 2nd Ed. New York: McGraw Hill Book Co., 1988. Text.