Coba jelasin Rujukan dari Biogas dalam bahasa melayu dong

Updated Guidebook on Biogas Development. United Nations, New York, (1984) Energy Resources Development Series No. 27. p. 178, 30 cm.

Book: Biogas from Waste and Renewable Resources. WILEY-VCH Verlag GmbH & Co. KGaA, (2008) Dieter Deublein and Angelika Steinhauser

A Comparison between Shale Gas in China and Unconventional Fuel Development in the United States: Health, Water and Environmental Risks by Paolo Farah and Riccardo Tremolada. This is a paper presented at the Colloquium on Environmental Scholarship 2013 hosted by Vermont Law School (11 October 2013)

Woodhead Publishing Series. (2013). The Biogas Handbook: Science, Production and Applications.