Sufism: the mystical doctrines and methods of Islam. Wellingborough: Thorsons, 1976
Ed. with Seyyed Hossein Nasr Religion of the heart. essays presented to Frithjof Schuon on his eightieth birthday. Washington, D.C.: Foundation for Traditional Studies, 1991
Outline of Hinduism Washington, D.C. : Foundation for Traditional Studies, 1993
Outline of Buddhism Washington, D.C. : Foundation for Traditional Studies, 1997
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