APA (7th ed.) Zitazioa

Sumner, W. G. (1986). What social classes owe to each other (10a. ed.). Caxton Printers, Ltd.

Chicago Style (17th ed.) Zitazioa

Sumner, William Graham. What Social Classes Owe to Each Other. 10a. ed. Caldwell: Caxton Printers, Ltd, 1986.

MLA (9th ed.) Zitazioa

Sumner, William Graham. What Social Classes Owe to Each Other. 10a. ed. Caxton Printers, Ltd, 1986.