APA (7th ed.) Citation

Smith, R. L., & Smith, T. M. (2001). Ecología (4a. ed.). Pearson-Addison Wesley.

Chicago Style (17th ed.) Citation

Smith, Robert Leo, and Thomas M. Smith. Ecología. 4a. ed. Madrid: Pearson-Addison Wesley, 2001.

MLA (9th ed.) Citation

Smith, Robert Leo, and Thomas M. Smith. Ecología. 4a. ed. Pearson-Addison Wesley, 2001.