- Textual Sources for the Study of Zoroastrianism (Textual Sources for the Study of Religion)
- Zoroastrians: Their Religious Beliefs and Practices (Library of Religious Beliefs & Practices)
- Zoroastrianism: Its Antiquity and Constant Vigour
- A History of Zoroastrianism: Zoroastrianism Under Macedonian and Roman Rule, vol. III
- A Word-List of Manichaean Middle Persian and Parthian. (Textes et Memoires, Tome II, suppl.). (ACTA Iranica)