The wellsprings of wisdom a study of Abū Yaʿqūb al-Sijistānī's Kitāb al-Yanābīʿ including a complete English translation with commentary and notes on the Arabic text - Walker, Paul E. 1941-; Abū-Yaʿqūb as-Siǧistānī, Isḥāq Ibn-Aḥmad ca. 10. Jh. u.Z (Univ. of Utah Press, 1994)
Keywords: Abū Yaʻqūb al-Sijistānī, Isḥāq ibn Aḥmad <10th cent> -- Yanābīʻ; Abū-Yaʿqūb as-Siǧistānī, Isḥāq Ibn-Aḥmad -- ca. 10. Jh. u.Z. -- Kitāb al-Yanābīʿ; Geschichte; Ismailites -- Doctrines -- Early works to 1800; Ismailites -- Doctrines -- History