APA

Smith T. M., Smith R. L., . (2009). Elements of ecology. San Francisco: Pearson.

Chicago

Smith Thomas M, Smith Robert Leo, . 2009. Elements of ecology. San Francisco: Pearson.

Harvard

Smith T. M., Smith R. L., . (2009). Elements of ecology. San Francisco: Pearson.

MLA

Smith Thomas M, Smith Robert Leo, . Elements of ecology. San Francisco: Pearson. 2009.