Cita APA (7a ed.)

Cohen, D. Precalculus with unit-circle and trigonometry (1a. ed.).

Cita Chicago Style (17a ed.)

Cohen, David. Precalculus with Unit-circle and Trigonometry. 1a. ed. St. Paul (Minn.) West 1990.

Cita MLA (8a ed.)

Cohen, David. Precalculus with Unit-circle and Trigonometry. 1a. ed.