Cita APA (7th ed.)

Gottfried, S. S. (1993). Biology today (2nd ed.). Mosby.

Cita Chicago (17th ed.)

Gottfried, Sandra S. Biology Today. 2nd ed. St. Louis: Mosby, 1993.

Cita MLA (9th ed.)

Gottfried, Sandra S. Biology Today. 2nd ed. Mosby, 1993.