↑ Professor Seyyed Hossein Nasr and Professor Mehdi Aminrazavi. "An Anthology of Philosophy in Persia, Vol. 1: From Zoroaster to Umar Khayyam", I.B. Tauris in association with The Institute of Ismaili Studies, 2007. Pg 135: "Morever, he was a master of music theory; his Kitab al-Musiqa al-Kabir (The Great book on Music), known in the West as a book on Arabic music, is in reality a study of the theory of Persian music of his day as well as presenting certain great philosophical principle about music, its cosmic qualities, and its influence on the soul"
↑ Amber Haque (2004), "Psychology from Islamic Perspective: Contributions of Early Muslim Scholars and Challenges to Contemporary Muslim Psychologists", Journal of Religion and Health 43 (4): 357-377 [363].
