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)