↑ Dhanani, Alnoor (2007), Fārābī: Abū Naṣr Muḥammad ibn Muḥammad ibn Tarkhān al‐Fārābīin Thomas Hockey et al, The Biographical Encyclopedia of Astronomers, New York: Springer, pp. 356–7, ISBN 978-0-387-31022-0, <http://islamsci.mcgill.ca/RASI/BEA/Farabi_BEA.htm> (PDF version) 