References

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Balcombe, Jonathan2006. Pleasurable Kingdom: Animals and the Nature of Feeling Good. London : Macmillan.

Bekoff, Marc2007a. The Emotional Lives of Animals: A Leading Scientist Explores Animal Joy, Sorrow, and Empathy—and Why They Matter. Novato, Calif.: New World Library.

Bekoff, Marc2007b. Animals Matter: A Biologist Explains Why We Should Treat Animals with Compassion and Respect. Boston : Shambhala.

Bekoff, Marc2008. Animals at Play: Rules of the Game. Philadelphia : Temple Univ. Press.

Bekoff, Marc, and JessicaPierce In press. Wild Justice: The Moral Lives of Animals. Chicago : Univ. of Chicago Press.

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Langford, D. J., S. E.Crager, Z.Shehzad, S. B.Smith, S. G.Sotocinal, J. S.Levenstadt, M. L.Chanda, D. J.Levitin, and J. S.Mogil. 2006. “Social Modulation of Pain as Evidence for Empathy in Mice.Science  312:1967.

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