(2005). Thinkwell's precalculus. [Austin Tex]: Thinkwell Corporation.
Trích dẫn kiểu ChicagoThinkwell's Precalculus. [Austin Tex]: Thinkwell Corporation, 2005.
Deismireacht MLAThinkwell's Precalculus. [Austin Tex]: Thinkwell Corporation, 2005.
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