Cita APA (7th ed.)

Kraus, D., & Perkins, O. E. (1974). Concepts in modern biology. Cambridge Book.

Cita Chicago (17th ed.)

Kraus, David, i Otho E. Perkins. Concepts in Modern Biology. New York: Cambridge Book, 1974.

Cita MLA (9th ed.)

Kraus, David, i Otho E. Perkins. Concepts in Modern Biology. Cambridge Book, 1974.