Bibliographic details: "The biogas handbook: Science, production and applications"
Edited by A Wellinger, Nova Energie, Switzerland, J Murphy, University College Cork, Ireland and D Baxter, Institute for Energy and Transport (IET), Joint Research Centre (JRC), The Netherlands, Woodhead Publishing Limited, 2013, ISBN-13: 978 0 85709 498 8. The cost of the book is US$280.
http://www.woodheadpublishing.com/en/book.aspx?bookID=2576
(I've downloaded the 512-page tome but with no time to read it... perhaps on my 2-week break in June.)
Cheers, Duncan