(2001). Thinkwell's precalculus. [Austin, Tex.]: Thinkwell.
Trích dẫn kiểu ChicagoThinkwell's Precalculus. [Austin, Tex.]: Thinkwell, 2001.
Deismireacht MLAThinkwell's Precalculus. [Austin, Tex.]: Thinkwell, 2001.
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