Cohen, D. 1. S. 2., Lee, T., & Sklar, D. (2006). Precalculus: A problems-oriented approach (Custom ed. prepared exclusively for University California, Davis.). Thomson Custom Solutions.
Lua i Stíl Chicago (17ú heag.)Cohen, David 1942 Sept. 28-, Theodore Lee, agus David Sklar. Precalculus: A Problems-oriented Approach. Custom ed. prepared exclusively for University California, Davis. Mason, Ohio: Thomson Custom Solutions, 2006.
Lua MLA (9ú heag.)Cohen, David 1942 Sept. 28-, et al. Precalculus: A Problems-oriented Approach. Custom ed. prepared exclusively for University California, Davis. Thomson Custom Solutions, 2006.
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