Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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