Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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