Cita APA (7th ed.)

Townsend, C. R. (2003). Essentials of ecology. Sinauer Associates.

Cita Chicago (17th ed.)

Townsend, Colin R. Essentials of Ecology. Sunderland, MA: Sinauer Associates, 2003.

Cita MLA (9th ed.)

Townsend, Colin R. Essentials of Ecology. Sinauer Associates, 2003.