[Vol.1]
Language and Magic: Studies in the Magical Function of Speech (1956)
[Vol.2]
The Structure of the Ethical Terms in the Koran: A Study in Semantics (1959)
[Vol.3]
God and Man in the Koran (1964)
[Vol.4]
The Concept of Belief in the Islamic Theology (1965)
[Vol. 5]
A Comparative Study of the Key Philosophical Concepts in Sufism and Taoism (1966−67)
[Vol. 6]
The Concept and Reality of Existence (1971)