Richard Bulliet, Pamela Crossley, Daniel Headrick, Steven Hirsch, Lyman Johnson e David Northrup, The Earth and Its Peoples, 3ª ed., Boston, Houghton Mifflin Company, 2005, ISBN0-618-42770-8.
W. C. Rufus, The Influence of Islamic Astronomy in Europe and the Far East, in Popular Astronomy, vol. 47, n. 5, maggio 1939, pp. 233–238 [237], Bibcode:1939PA.....47..233R.