APA (7th ed.) Zitazioa

Richards, L. E. (1983). Business statistics: Why and when (2nd ed.). McGraw - Hill.

Chicago Style (17th ed.) Zitazioa

Richards, Larry E. Business Statistics: Why and When. 2nd ed. New York: McGraw - Hill, 1983.

MLA (9th ed.) Zitazioa

Richards, Larry E. Business Statistics: Why and When. 2nd ed. McGraw - Hill, 1983.