APA (7th ed.) Zitazioa

Gottfried, S. S. (1993). Biology today. Mosby.

Chicago Style (17th ed.) Zitazioa

Gottfried, Sandra S. Biology Today. Baltimore: Mosby, 1993.

MLA (9th ed.) Zitazioa

Gottfried, Sandra S. Biology Today. Mosby, 1993.