Não informado. (2004). Sewage and Industrial Wastes. Federation of Sewage Works Associations.
Chicago-referens (17:e uppl.)Não informado. Sewage and Industrial Wastes. Champaign, Ill: Federation of Sewage Works Associations, 2004.
MLA-referens (8:e uppl.)Não informado. Sewage and Industrial Wastes. Federation of Sewage Works Associations, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.