Cita APA (7th ed.)

Smith, T., & Smith, R. L. (2012). Elements of ecology (Eight edition.). Pearson Education South Asia Pte Ltd.

Cita Chicago (17th ed.)

Smith, T.M., i Robert Leo Smith. Elements of Ecology. Eight edition. Jurong, Singapore: Pearson Education South Asia Pte Ltd, 2012.

Cita MLA (9th ed.)

Smith, T.M., i Robert Leo Smith. Elements of Ecology. Eight edition. Pearson Education South Asia Pte Ltd, 2012.