Não informado. (2001). Water services. Fuel and Metallurgical Journals.
Chicago-referens (17:e uppl.)Não informado. Water Services. Redhill, Inglaterra: Fuel and Metallurgical Journals, 2001.
MLA-referens (8:e uppl.)Não informado. Water Services. Fuel and Metallurgical Journals, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.