Tolong jelaskan mengenai Bacaan tambahan dari Hassan-i Sabbah

Hasan-I-Sabbah: His Life and Thought by Dr. Ali Mohammad Rajput

Hassan-i Sabbah, al-Fuṣūl al-arba'a ("The Four Chapters"), tr. Marshall G.S. Hodgson, in Ismaili Literature Anthology. A Shi'i Vision of Islam, ed. Hermann Landolt, Samira Sheikh and Kutub Kassam. London, 2008. pp. 149–52. Persian treatise on the doctrine of ta'līm. The text is no longer extant, but fragments are cited or paraphrased by al-Shahrastānī and several Persian historians.