APA (7th ed.) Citation

Leff, L. S. (2005). Precalculus the easy way. Barron's.

Chicago Style (17th ed.) Citation

Leff, Lawrence S. Precalculus the Easy Way. Hauppauge, N.Y: Barron's, 2005.

MLA (9th ed.) Citation

Leff, Lawrence S. Precalculus the Easy Way. Barron's, 2005.