APA (7 वां संस्करण) प्रशस्ति पत्र
Willis, J. (2012). Methane evolution from wastewater conveyance. Water Environment Research Foundation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Willis, John. Methane Evolution from Wastewater Conveyance. Alexandria, VA: Water Environment Research Foundation, 2012.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Willis, John. Methane Evolution from Wastewater Conveyance. Water Environment Research Foundation, 2012.
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