APA (7th ed.) Citation

Enger, E. D., Kormelink, J. R., & Ross, F. C. (1991). Concepts in biology (6th edition.). Wm. C. Brown Publishers.

Chicago Style (17th ed.) Citation

Enger, Eldon D., J. Richard Kormelink, and Frederick C. Ross. Concepts in Biology. 6th edition. Dubuque, IA: Wm. C. Brown Publishers, 1991.

MLA (8th ed.) Citation

Enger, Eldon D., et al. Concepts in Biology. 6th edition. Wm. C. Brown Publishers, 1991.