Gaya APA

WALSTAD, W, B., BINGHAM, R, C. (2002). Study guide to accompany McConnell and Brue economics (15th ed.). Boston: McGraw-Hill Irwin.

Gaya MLA

WALSTAD, William, B.., BINGHAM, Robert, C.. "Study guide to accompany McConnell and Brue economics". 15th ed. Boston: McGraw-Hill Irwin, 2002. Buku.