Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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