APA-viite (7. p.)
Willis, J. (2012). Methane evolution from wastewater conveyance. Water Environment Research Foundation.
Chicago-viite (17. p.)
Willis, John. Methane Evolution from Wastewater Conveyance. Alexandria, VA: Water Environment Research Foundation, 2012.
MLA-viite (9. p.)
Willis, John. Methane Evolution from Wastewater Conveyance. Water Environment Research Foundation, 2012.
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