Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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