APA-referens (7:e uppl.)
Willis, J. (2012). Methane evolution from wastewater conveyance. Water Environment Research Foundation.
Chicago-referens (17:e uppl.)
Willis, John. Methane Evolution from Wastewater Conveyance. Alexandria, VA: Water Environment Research Foundation, 2012.
MLA-referens (9:e uppl.)
Willis, John. Methane Evolution from Wastewater Conveyance. Water Environment Research Foundation, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.