The Myth of Afterlife. (Jefferson, NC: McFarland, forthcoming) ed. with K. Augustine.

    The Cambridge Companion to Atheism (Cambridge: Cambridge University Press, 2006) ed. Translated into Portuguese (2007), Finnish (2011), Croatian (2011)

    The Improbability of God (Buffalo: Prometheus Books, 2006) ed. with Ricki Monnier

    The Impossibility of God (Buffalo: Prometheus Press, 2003) ed. with Ricki Monnier

    Atheism, Morality and Meaning (Buffalo: Prometheus Books, 2002)

    Theism vs. Atheism: The Internet Debate (Brenerton, WA: IBD Press, 2000) with P. Fernandes

    Verstehen: A Critical Appraisal (New Jersey: Transaction Books, 2000)

    Legal Realism: American and Scandinavian (New York: Peter Lang, 1996)

    The Big Domino in The Sky and Other Atheistic Tales (Buffalo: Prometheus Books, 1996)

    Readings in the Philosophy of Social Science (Cambridge: The MIT Press, 1994) ed. with L. McIntyre.

    The Case Against Christianity (Philadelphia: Temple University Press, 1991) Translated into Romanian (2007), Spanish (2007)

    Atheism: A Philosophical Justification (Philadelphia: Temple University Press, 1990)

    The Legal Philosophy of H.L.A. Hart: A Critical Appraisal (Philadelphia: Temple University Press, 1987)

    Social Science and Philosophical Analysis: Essays on The Philosophy of The Social Sciences (Washington, D.C.: University Press Of America, 1978)

    Concepts of Science Education: A Philosophical Analysis (Chicago: Scott-Foresman, 1972)

    Probability, Confirmation and Simplicity (New York: Odyssey Press, 1966) ed. with M. Foster