Animal Nutrition, McDonald, P., Edwards, R.A., Greenhalgh, J.F.D. and Morgan, C.A. 1995, Fifth Edition, Longman Scientific and Technical, SF95.M18.1995.
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Brock Biology of Microorganisms, Madigan, M.T., Martinko, J.M. and Parker, J. 1997, Eighth edition, Prentice Hall, Upper Saddle River, NJ, USA. QR41.B718.1997
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Ecology and Evolution in Anoxic Worlds, Fenchel, T. and Finlay, B.J. Oxford University Press, Oxford, UK,  QH518.5.F46, 1995.
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Methanogenesis: Ecology, Physiology, Biochemistry and Genetics, Edited by J.G. Ferry, Chapman-Hall, NY, QR92.M46 M47, 1993.
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Nutritional Ecology of the Ruminant, van Soest, P.J., Cornell University Press, Ithaca, NY, SF95.V36, 1994.
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The Physiology and Biochemistry of Prokaryotes, White, D., Oxford University Press, NY, 1995
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Quantitative Aspects of Ruminant Digestion and Metabolism. Edited by J.M. Forbes and J. France, CAB International, Wallingford, UK, SF768.2.R8 Q35, 1993.
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The Rumen Microbial Ecosystem, Edited by P.N. Hobson and C.S. Stewart, Elsevier Applied Science, London, UK, QR171.R85 R86, 1997.
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Rumen Microbial Metabolism and Ruminant Digestion, Edited by J.P. Jouany, Institut National de la Recherche Agronomique, SF768.2.R8 R84, 1991.
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Symbiotic Interactions, Douglas, A.E.,1994, Oxford University Press, Oxford, UK, QH548.D68.1994.
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