APA (7th ed.) Citation

Gilbert, G. T., Krusemeyer, M. I., & Larson, L. C. (1993). The Wohascum county problem book. The Mathematical Association of America.

Chicago Style (17th ed.) Citation

Gilbert, George Thomas, Mark I. Krusemeyer, and Loren C. Larson. The Wohascum County Problem Book. Washington, D.C: The Mathematical Association of America, 1993.

MLA (9th ed.) Citation

Gilbert, George Thomas, et al. The Wohascum County Problem Book. The Mathematical Association of America, 1993.