Walstad, W. B., Bingham, R. C., McConnell, C. R., & Brue, S. L. (1993). Study guide to accompany McConnell and BrueMicroeconomic (12th ed.). McGraw-Hill.

Walstad, William B., Robert C. Bingham, Campbell R. McConnell, and Stanley L. Brue. Study Guide to Accompany McConnell and BrueMicroeconomic. 12th ed. New York: McGraw-Hill, 1993.

Walstad, William B., et al. Study Guide to Accompany McConnell and BrueMicroeconomic. 12th ed. McGraw-Hill, 1993.