Não informado. (2001). Water services. Fuel and Metallurgical Journals.
Chicago-Zitierstil (17. Ausg.)Não informado. Water Services. Redhill, Inglaterra: Fuel and Metallurgical Journals, 2001.
MLA-Zitierstil (8. Ausg.)Não informado. Water Services. Fuel and Metallurgical Journals, 2001.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.