Bruce Hoffman, "Holy terror": The implications of terrorism motivated by a religious imperative, in Studies in Conflict & Terrorism, vol. 18, n. 4, 1995, pp. 271–84, DOI:10.1080/10576109508435985, ISSN 1057-610X (WC · ACNP).
«The most detailed and comprehensive study of the group can be found in Bernard Lewis, The Assassins: A Radical Sect in Islam (London: A1 Saqi Books, 1985).»