Cita APA (7th ed.)

Smith, R. L., & Smith, T. M. (2003). Elements of ecology (5th ed.). Benjamin Cummings.

Cita Chicago (17th ed.)

Smith, Robert Leo, i T. M. Smith. Elements of Ecology. 5th ed. San Francisco, CA: Benjamin Cummings, 2003.

Cita MLA (9th ed.)

Smith, Robert Leo, i T. M. Smith. Elements of Ecology. 5th ed. Benjamin Cummings, 2003.