APA-referens (7:e uppl.)

Welkowitz, J., & Ewen, R. B. ,. (1971). Introductory statistics for the behavioral sciences. Academic Press.

Chicago-referens (17:e uppl.)

Welkowitz, Joan, och Robert B. ,Cohen Ewen. Introductory Statistics for the Behavioral Sciences. New York: Academic Press, 1971.

MLA-referens (9:e uppl.)

Welkowitz, Joan, och Robert B. ,Cohen Ewen. Introductory Statistics for the Behavioral Sciences. Academic Press, 1971.