Cita APA (7th ed.)

Smith, T. M., & Smith, R. L. (2009). Elements of ecology (7th ed.). Pearson Benjamin Cummings.

Cita Chicago (17th ed.)

Smith, T. M., i Robert Leo Smith. Elements of Ecology. 7th ed. San Francisco: Pearson Benjamin Cummings, 2009.

Cita MLA (9th ed.)

Smith, T. M., i Robert Leo Smith. Elements of Ecology. 7th ed. Pearson Benjamin Cummings, 2009.