In addition to the works cited in the article: Major aspects of early Isma'ili history and doctrine are examined in:

B. Lewis, The origins of Isma'ilism, Cambridge 1940

W. Ivanow, Ismaili tradition concerning the rise of the Fatimids, London 1942

idem, Studies in early Pesian Ismailism2, Bombay 1955

S. M. Stern, Heterodox Ismailism in the time of al-Mu'izz, in BSOAS, xvii (1955), 10-30. On Nizari history and doctrine in the Alamut period: M. G. S. Hodgson, The order of Assassins, The Hague 1955, (fundamental)

idem, The Isma'ili state, in The CambridgeqHistory of Iran, v, Cambridge 1968, 422-82

B. Lewis, The Assassins, London 1967. On the Syrian Nizaris in the time of the crusades: B. Lewis, The Isma'ilis and the Assassins, in K. M. Setton (ed.), A history of the Crusades, i, Philadelphia 1955, 99-132. On the history, doctrine, and present state of the Bohoras and Khodjas: J. N. Hollister, The Shi'a of India, London 1953. Analysis of Isma'ili gnostic doctrine: H. Corbin, De la gnose antique a la gnose ismaelienne, in Convegno di scienze morali storiche e filologiche 1956, Rome 1957, 105-46

idem, Histoire de la philosophie islamique, i, Paris 1964, 110-51. Analytical bibliography of published and unpublished Isma'ili works: W. Ivanow, Ismaili Literature, Tehran 1963. General, but unequal surveys of Isma'ili history and doctrine have been given by W. Ivanow, Brief survey of the evolution of Ismailism, Leiden 1952

M. Kamil Husayn, Ta'ifat al-Isma'iliyya, Cairo 1959.