Não informado. (1989). Water Environment & Technology. Water Pollution Control Federation.
Chicago-referens (17:e uppl.)Não informado. Water Environment & Technology. Alexandria, Va: Water Pollution Control Federation, 1989.
MLA-referens (8:e uppl.)Não informado. Water Environment & Technology. Water Pollution Control Federation, 1989.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.