Cita APA (7th ed.)
Cohen, D. (1987). Precalculus: A problems - Oriented approach (2nd ed.). West Publishing Co..
Cita Chicago (17th ed.)
Cohen, David. Precalculus: A Problems - Oriented Approach. 2nd ed. St Paul: West Publishing Co., 1987.
Cita MLA (9th ed.)
Cohen, David. Precalculus: A Problems - Oriented Approach. 2nd ed. West Publishing Co., 1987.
Atenció: Aquestes cites poden no estar 100% correctes.