Gaya APA

Walstad, W, B, ;, B, R, C. (2002). Study guide to company economics, 15 th ed. . New York: McGraw-Hill.

Gaya MLA

Walstad, William, B., ;, Bingham,, Robert, C.. "Study guide to company economics, 15 th ed.". New York: McGraw-Hill, 2002. Text.