Cita APA (7a ed.)

Smith, R. L., Smith, T. M., & Smith, R. L., Jr. (2001). Ecology & field biology (6th ed.). Benjamin Cummings.

Cita Chicago Style (17a ed.)

Smith, Robert Leo, T. M. Smith, y Robert Leo Smith, Jr. Ecology & Field Biology. 6th ed. San Francisco [etc.]: Benjamin Cummings, 2001.

Cita MLA (9a ed.)

Smith, Robert Leo, et al. Ecology & Field Biology. 6th ed. Benjamin Cummings, 2001.