Hasmi, Hazwani, and Faieza Buyong. “Influence of Temperature and Water to Poultry Waste Ratio on Methane Production from Anaerobic Digestion”. International Journal of Engineering & Technology, vol. 7, no. 3.11, July 2018, pp. 254-7, https://doi.org/10.14419/ijet.v7i3.11.16020.