Walking the Tightrope of Reason New York. Oxford University Press, 2003
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A Defense of Hume on Miracles
Princeton, Princeton University Press, 2003
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Berkeley and the Principles of Human Knowledge London: Routledge, 2001
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Pyrrhonian Reflections on Knowledge and Justification Oxford: Oxford University Press, 1994
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Philosophical Interpretations Oxford: Oxford University Press, 1992
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Wittgenstein (2nd edition) London: Routledge and Kegan Paul, 1987
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Hume's Skepticism London: Routledge and Kegan Paul, 1985
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Wittgenstein London: Routledge and Kegan Paul, 1976
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Evidence and Meaning London: Routledge and Kegan Paul, 1967