↑ Seyyed Hossain Nasr, "Philosophy and Cosmology," in Frye, ed., The Cambridge History of Iran, pp 421. Quote: "the first person mentioned in traditional sources as having devoted himself to philosophy in the Islamic period is Abu'l-Abbas Iranshahri, who flourished in the 3rd/9th century.."
↑ Abu rihan, Al-Biruni. Critical study of what India says, whether accepted by reason or refused, Volume One. pp. 4, 5.
