Cita APA (7th ed.)

Smith, T. M., & Smith, R. L. (2006). Elements of ecology (6th ed.). Pearson/Benjamin Cummings.

Cita Chicago (17th ed.)

Smith, T. M., i Robert Leo Smith. Elements of Ecology. 6th ed. San Francisco, Calif: Pearson/Benjamin Cummings, 2006.

Cita MLA (9th ed.)

Smith, T. M., i Robert Leo Smith. Elements of Ecology. 6th ed. Pearson/Benjamin Cummings, 2006.