APA-referens

 Hellawell, J. M. (1986).  Biological indicators of freshwater pollution and environmental management.  Elsevier Applied Science Publishers.

Chicago-stil citat

 Hellawell, J. M.  Biological Indicators of Freshwater Pollution and Environmental Management.  Elsevier Applied Science Publishers, 1986.

MLA-referens

 Hellawell, J. M.  Biological Indicators of Freshwater Pollution and Environmental Management.  Elsevier Applied Science Publishers, 1986.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.