Leff, L. S. (2005). Precalculus the easy way. Barron's.
Chicago Style (17th ed.) CitationLeff, Lawrence S. Precalculus the Easy Way. Hauppauge, N.Y: Barron's, 2005.
MLA (9th ed.) CitationLeff, Lawrence S. Precalculus the Easy Way. Barron's, 2005.
Warning: These citations may not always be 100% accurate.