des Assassins in Mémoires de l'Institut Royal de France, Vol. IV. (1818); Hastings Encyclopædia of Religion and Ethics; Syed Ameer Ali, The Spirit of Islam (1922); Dr. F. W. Bussell, Religious Thought and Heresy in the Middle Ages* (1918).
- Reinhart Dozy, Spanish Islam (Eng. trans.), pp. 403-5.
- Claudio Jannet, Les Précurseurs de la Franc-Moçonnerie, p. 58 (1887).
- The following account is given by de Sacy in connexion with Abdullah ibn Maymūn (op. cit., I. Ixxiv), and Dr. Bussell (Religious Thought and Heresy in the Middle Ages, p. 353) includes it in his chapter on the Karmathites. Von Hammer, however, gives it as the programme of the Dar ul Hikmat, and this seems more probable since the initiation consists of nine degrees and Abdullah's society of Batinis,