Gaya APA

Chisholm, R., McCarty, M. (1981). Principles of Economics Ed. 2 (Ke-2). Amerika: Scott, Foresman and Company.

Gaya MLA

Chisholm, Roger., McCarty, Marilu. "Principles of Economics Ed. 2". Ke-2 Amerika: Scott, Foresman and Company, 1981. Text.