Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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