Jabarkan Sarguzasht-e Sayyidnā dari Hassan-i Sabbah

Daftary, Farhad, A Short History of the Ismā'īlīs. Edinburgh: Edinburgh University Press, 1998.

Daftary, Farhad, The Assassin Legends: Myths of the Ismā'īlīs. London: I.B. Tauris & Co. Ltd, 1994. Reviewed by Babak Nahid at Ismaili.net

Daftary, Farhad, "Hasan-i Sabbāh and the Origins of the Nizārī Ismā'īlī movement." In Mediaeval Ismā'īlī History and Thought, ed. Farhad Daftary. Cambridge: Cambridge University Press, 1996. 181–204.

Hodgson, Marshall, The Order of Assassins. The Struggle of the Early Nizārī Ismā'īlī Against the Islamic World. The Hague: Mouton, 1955.

Hodgson, Marshall, "The Ismā'īlī State." In The Cambridge History of Iran, vol. 5: The Saljuq and Mongol Periods, ed. J.A. Boyle. Cambridge: Cambridge University Press, 1968. 422–82.

Lewis, Bernard, The Assassins. A Radical Sect in Islam. New York: Basic Books, 1968.

Madelung, Wilferd, Religious Trends in Early Islamic Iran. Albany: Bibliotheca Persica, 1988. 101–5.

The life of Hassan-i-Sabah from an Ismaili point of view.  Focuses on assassination as a tactic of asymmetrical warfare and has a small section on Hasan-i-Sabah's work as a scholar.

Introduction to The Assassin Legends  (From The Assassin Legends: Myths of the Isma‘ilis, London: I. B. Tauris, 1994; reprinted 2001.)

The life of Hassan-i-Sabbah as part of an online book on the Assassins of Alamut.