Gilbert, G. T., Krusemeyer, M. I., & Larson, L. C. (1993). The Wohascum county problem book. The Mathematical Association of America.
Lua i Stíl Chicago (17ú heag.)Gilbert, George Thomas, Mark I. Krusemeyer, agus Loren C. Larson. The Wohascum County Problem Book. Washington, D.C: The Mathematical Association of America, 1993.
Lua MLA (9ú heag.)Gilbert, George Thomas, et al. The Wohascum County Problem Book. The Mathematical Association of America, 1993.
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