Cita APA (7th ed.)
Enger, E. D. (1997). Concepts in biology (8th ed.). Wm. C. Brown Publishers.
Cita Chicago (17th ed.)
Enger, Eldon D.Ross. Concepts in Biology. 8th ed. Dubuque, IA: Wm. C. Brown Publishers, 1997.
Cita MLA (9th ed.)
Enger, Eldon D.Ross. Concepts in Biology. 8th ed. Wm. C. Brown Publishers, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.