APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Smith, Thomas M., and Robert Leo Smith. Elements of Ecology. 6. ed. San Francisco: Pearson, 2006.

MLA (9th ed.) Citation

Smith, Thomas M., and Robert Leo Smith. Elements of Ecology. 6. ed. Pearson, 2006.