Não informado. (1881). Proceedings of the American Water Works Association. American Water Works Association.
Chicago-referens (17:e uppl.)Não informado. Proceedings of the American Water Works Association. Denver, Colo: American Water Works Association, 1881.
MLA-referens (8:e uppl.)Não informado. Proceedings of the American Water Works Association. American Water Works Association, 1881.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.