APA (7th ed.) Zitazioa

WALKER, H. M. (1969). Elementary statistical methods. Holt, Rinehart and Winston.

Chicago Style (17th ed.) Zitazioa

WALKER, Helen M. Elementary Statistical Methods. New York: Holt, Rinehart and Winston, 1969.

MLA (9th ed.) Zitazioa

WALKER, Helen M. Elementary Statistical Methods. Holt, Rinehart and Winston, 1969.