(2005). Thinkwell's precalculus. [Austin Tex]: Thinkwell Corporation.
Chicago Style aipamenaThinkwell's Precalculus. [Austin Tex]: Thinkwell Corporation, 2005.
MLA aipamenaThinkwell's Precalculus. [Austin Tex]: Thinkwell Corporation, 2005.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.