Wellinger, A., Murphy, J., & Baxter, D. (2013). The biogas handbook: Science, production and applications. Woodhead Publishing.

Wellinger, A., Jerry Murphy, and David Baxter. The Biogas Handbook: Science, Production and Applications. Oxford: Woodhead Publishing, 2013.

Wellinger, A., et al. The Biogas Handbook: Science, Production and Applications. Woodhead Publishing, 2013.