Cita APA (7th ed.)

Ritchie, D. (1983). Biology (2nd ed.). Addison-Wesley Publishing Company.

Cita Chicago (17th ed.)

Ritchie, Donald. Biology. 2nd ed. Reading, Mass.: Addison-Wesley Publishing Company, 1983.

Cita MLA (9th ed.)

Ritchie, Donald. Biology. 2nd ed. Addison-Wesley Publishing Company, 1983.