Não informado. (1990). Research Journal of the Water Pollution Control Federation. Water Pollution Control Federation.
Chicago-referens (17:e uppl.)Não informado. Research Journal of the Water Pollution Control Federation. Alexandria, Va: Water Pollution Control Federation, 1990.
MLA-referens (8:e uppl.)Não informado. Research Journal of the Water Pollution Control Federation. Water Pollution Control Federation, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.