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.
Atenció: Aquestes cites poden no estar 100% correctes.