Citazione APA

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

Stile di citazione Chicago

Smith, Robert Leo, e T. M. Smith. Elements of Ecology. 4th ed. update. San Francisco: Benjamin Cummings, 2000.

Citazione MLA

Smith, Robert Leo, e T. M. Smith. Elements of Ecology. 4th ed. update. Benjamin Cummings, 2000.