APA (7 वां संस्करण) प्रशस्ति पत्र
Yimer, B. (2014). Alternative energy sources to combat climate change: Biogas production using cost effective material. Anchor Academic Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Yimer, Bezabih. Alternative Energy Sources to Combat Climate Change: Biogas Production Using Cost Effective Material. Hamburg, Germany: Anchor Academic Publishing, 2014.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Yimer, Bezabih. Alternative Energy Sources to Combat Climate Change: Biogas Production Using Cost Effective Material. Anchor Academic Publishing, 2014.
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