Não informado. (1967). Water Pollution Control. Institute of Water Pollution Control.
Chicago-referens (17:e uppl.)Não informado. Water Pollution Control. London: Institute of Water Pollution Control, 1967.
MLA-referens (8:e uppl.)Não informado. Water Pollution Control. Institute of Water Pollution Control, 1967.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.