Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Kraus, David, y Otho E. Perkins. Concpts in Modern Biology. New York: Cambridge Book Company, 1974.

Cita MLA (9a ed.)

Kraus, David, y Otho E. Perkins. Concpts in Modern Biology. Cambridge Book Company, 1974.