Cita APA (7th ed.)

Enger, E. D., & Kormelink, J. R. (1991). Concepts in biology (6th ed.). WCB.

Cita Chicago (17th ed.)

Enger, Eldon D., i J. Richard Kormelink. Concepts in Biology. 6th ed. Boulevard: WCB, 1991.

Cita MLA (9th ed.)

Enger, Eldon D., i J. Richard Kormelink. Concepts in Biology. 6th ed. WCB, 1991.