Cita APA (7th ed.)
Enger, E. D. (1979). Concepts in biology (2d ed.). W. C. Brown Co..
Cita Chicago (17th ed.)
Enger, Eldon D. Concepts in Biology. 2d ed. Dubuque, Iowa: W. C. Brown Co., 1979.
Cita MLA (9th ed.)
Enger, Eldon D. Concepts in Biology. 2d ed. W. C. Brown Co., 1979.
Atenció: Aquestes cites poden no estar 100% correctes.