Gaya APA

Ulbrich, R, C, A, ;, H, H. (1986). Principles of macroeconomics (ed. 3). dallas: South-Western.

Gaya MLA

Ulbrich, Ryan, C., Amacher, ;, Holley, H.. "Principles of macroeconomics". ed. 3 dallas: South-Western, 1986. Text.