Citazione Stile APA (7a Edizione)

Cohen, D. (1994). Precalculus with unit-circle trigonometry (2nd ed.). West Publishing Company.

Citazione stile Chigago Style (17a edizione)

Cohen, David. Precalculus with Unit-circle Trigonometry. 2nd ed. Minneapolis, NY: West Publishing Company, 1994.

Citatione MLA (9a ed.)

Cohen, David. Precalculus with Unit-circle Trigonometry. 2nd ed. West Publishing Company, 1994.