Cita APA

 Smith, T. M. (2009).  Elements of ecology.  Pearson Benjamin Cummings.

Chicago Style Citation

 Smith, Thomas M.  Elements of Ecology.  Pearson Benjamin Cummings, 2009.

Cita MLA

 Smith, Thomas M.  Elements of Ecology.  Pearson Benjamin Cummings, 2009.

Atenció: Aquestes cites poden no estar 100% correctes.