Cita APA (7th ed.)

Enger, E. D., & Ross, F. C. (2005). Concepts in biology (11th ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Enger, Eldon D., i Frederick C. Ross. Concepts in Biology. 11th ed. Boston: McGraw-Hill, 2005.

Cita MLA (9th ed.)

Enger, Eldon D., i Frederick C. Ross. Concepts in Biology. 11th ed. McGraw-Hill, 2005.