Cita APA (7a ed.)

Ravera, O. (1979). Biological aspects of freshwater pollution. Pergamon Press Ltd.

Cita Chicago Style (17a ed.)

Ravera, O. Biological Aspects of Freshwater Pollution. Oxford: Pergamon Press Ltd, 1979.

Cita MLA (9a ed.)

Ravera, O. Biological Aspects of Freshwater Pollution. Pergamon Press Ltd, 1979.