Gilbert, G. T., Larson, L. C., & Krusemeyer, M. (1993). The Wohascum County problem book. Mathematical Association of America.
芝加哥风格引文Gilbert, George Thomas, Loren C. Larson, 与 Mark Krusemeyer. The Wohascum County Problem Book. [Washington, D.C.]: Mathematical Association of America, 1993.
MLA引文Gilbert, George Thomas, et al. The Wohascum County Problem Book. Mathematical Association of America, 1993.
警告：这些引文格式不一定是100％准确.