William Bayne Fisher, J. A. Boyle, John Andrew Boyle, Ilya Gershevitch, Ehsan Yarshater, Richard Nelson Frye, Peter Avery, Peter Jackson, Laurence Lockhart, Charles Peter Melville, Gavin Hambly. The Cambridge History of Iran, Volum 5 (en anglès). Cambridge University Press, 1968, p. 191. ISBN 9780521069366.
