APA (7th ed.) Zitazioa

Schefler, W. C. (1976). Biology: Principles and issues. Addison - Wesley.

Chicago Style (17th ed.) Zitazioa

Schefler, William C. Biology: Principles and Issues. Reading Mass: Addison - Wesley, 1976.

MLA (9th ed.) Zitazioa

Schefler, William C. Biology: Principles and Issues. Addison - Wesley, 1976.