1369. "Abu Ya'qub as-Sijistani. The Opening of the Persian Mission and the Beginning of Isma`ili Dogma." M.A. thesis, American University in Cairo, 1966.
1370. "A Byzantine Victory over the Fatimids at Alexandretta (971)," Byzantion XLII (1972): 431-440.
1371. "The Ismaili Vocabulary of Creation," S.I. XL (1974): 75-85. Study of the vocabulary used by Abu Ya'qub al Sijistani in Kitab al-Yanabi and al-Maqalid.
1372. "The Ismaili Answer to the Problems of Worshipping the Unknowable Neoplatonic God," A.J.A.S. II (1974): 7-21.
1373. "Abu Ya'cub al Sijistani and the Development of Isma'ili Neoplatonism." Ph.D. diss.,
University of Chicago, 1974. 226 pp.
1374. "Cosmic Hierarchies in Early Ismaili Thought: the View on Abu Yaqub al-Sijistani," M.W. LXVI (1976): 14-28.
1375. "An Early Ismaili Interpretation of Man, History and Salvation," Ohio Journal of Religious Studies III, no. 2 (1975): 29-35.
1376. "The `Crusade' of John Tzimisces in the Light of New Arabic Evidence," Byzantion, XLII (1977): 301-327. On Fatimids.
1377. "Eternal Cosmos and Womb of History: Time in Early Ismaili Thought," I.J.M.E.S. IX (1978): 355-366.
1378. "Abu Ya'qub al-Sijistani": Intellectual Missionary. s.v., Encycl. Iranica I, fasc. 4, pp. 396-398.
1379. "The Universal Soul and the Particular Soul in Ismaili Neoplatonism." In Neoplatonism and Islamic Thought, ed. Parviz Morewedge. Forthcoming.
1380. "Aga Khan," "Ismaili," "Imam,"and "Shi'a," s.v., Encycl. of Asian History. New York: Charles Scribner and Sons, forthcoming.
1380b. The Wellsprings of Wisdom: A study of Abu Ya qub al-Sijistani's Kitabal-Yanabi Including a Complete English Translation with Commentary and Notes on the Arabic Text.