Cita APA (7a ed.)

Ritchie, D. D., & Carola, R. (1983). Biology. Addison-Wesley Publishing Co..

Cita Chicago Style (17a ed.)

Ritchie, Donald D., y Robert Carola. Biology. California: Addison-Wesley Publishing Co., 1983.

Cita MLA (9a ed.)

Ritchie, Donald D., y Robert Carola. Biology. Addison-Wesley Publishing Co., 1983.