Cita APA (7th ed.)

Smith, R. L., & Smith, T. M. (2000). Elements of ecology (4th ed.). Benjamin Cummings.

Cita Chicago (17th ed.)

Smith, Robert Leo, i Thomas M. Smith. Elements of Ecology. 4th ed. San Francisco: Benjamin Cummings, 2000.

Cita MLA (9th ed.)

Smith, Robert Leo, i Thomas M. Smith. Elements of Ecology. 4th ed. Benjamin Cummings, 2000.