1. Challenges and opportunities in agrowaste management: An Asian perspective;Agamuthu;Inaugural Meeting of First Regional 3R Forum in Asia. Tokyo, Japan.,2009
2. A source book for the production and use of renewable natural gas in California;Krich;Biomethane from dairy waste 2005,2005
3. Jorgensen PJ. Biogas: Green Energy. 2nd edition. Plant Energy and Researcher for a Day. Faculty of Agricultural Sciences, Aarhus University. 2009.
4. Biogas handbook;Seadi,2008
5. Analysis and characterisation of biogas feedstocks;Drosg,2013