APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Enger, Eldon D., J. Richard Kormelink, Frederick Ross, and Rodney J. Smith. Concepts in Biology. Sixth edition. Dubuque, Iowa: Wm. C. Brown, 1991.

MLA (9th ed.) Citation

Enger, Eldon D., et al. Concepts in Biology. Sixth edition. Wm. C. Brown, 1991.