Mathematical Association of America, ebrary, Inc, Wells, D., & Faires, J. D. (2008). The contest problem book IX: American Mathematics Competitions (AMC 12) 2001-2007. Mathematical Association of America.
Citace podle Chicago (17th ed.)Mathematical Association of America, Inc ebrary, Dave Wells, a J. Douglas Faires. The Contest Problem Book IX: American Mathematics Competitions (AMC 12) 2001-2007. Washington, D.C.: Mathematical Association of America, 2008.
Citace podle MLA (9th ed.)Mathematical Association of America, et al. The Contest Problem Book IX: American Mathematics Competitions (AMC 12) 2001-2007. Mathematical Association of America, 2008.
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