Gaya APA

WALSTAD, W, B., BINGHAM, R, C. (2002). Study guide to accompany economics, 15 edition (15). new york: McGraw-Hill Book Company.

Gaya MLA

WALSTAD, William, B.., BINGHAM, Robert, C.. "Study guide to accompany economics, 15 edition". 15 new york: McGraw-Hill Book Company, 2002. Fakultas Bisnis.