Gaya APA

Walstad, W, B., Bingham, R, C. (2002). Study guide to a accompany macroeconomics (15th ed.). Boston, Massachusetts: McGraw-Hill Irwin.

Gaya MLA

Walstad, William, B.., Bingham, Robert, C.. "Study guide to a accompany macroeconomics". 15th ed. Boston, Massachusetts: McGraw-Hill Irwin, 2002. Text.