1317. "Ikhwan al-Safa, a Critical Study of a Century and a Half of Research," I.Q. II (1955).
1318. "Ikhwan al Safa and their Rasail," I.Q. II (1955): 28-46.
1319. "The Idea of Guidance in Islam," I.Q. III (1956): 139-158.
1320. "Some Educational Terms in Rasa'il Ikhwan as-Safa," 24 Int. Cong. Or. (1957): 297-299. Also in I.Q. (1959): 55-60.
1321. Arabic and Islamic Themes: Historical, Educational and Literary Studies. London: Luzac, 1976. Contains a chapter on Ikhwan al-Safa.
1322. "Further studies on the Ikhwan as-Safa," I.Q. (1978): 57-67.