Walstad, W. B. (1999). Study guide to accompany McConnell and Brue economics (14th ed.). Irwin/McGraw-Hill.
Cita Chicago (17th ed.)Walstad, William B. Study Guide to Accompany McConnell and Brue Economics. 14th ed. Boston: Irwin/McGraw-Hill, 1999.
Cita MLA (9th ed.)Walstad, William B. Study Guide to Accompany McConnell and Brue Economics. 14th ed. Irwin/McGraw-Hill, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.