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worldcat.org
Olbrycht, ss. 150, 152, 162–166, 203, 228; John Hansman. The Problems of Qūmis. „Journal of the Royal Asiatic Society of Great Britain and Ireland”. 1968. s. 113–115, 131–132. ISSN0035-869X. (ang.).; Ehsan Yarshater (ed.): The Cambridge History of Iran. Volume 3 (2). The Seleucid, Parthian and Sasanian Periods. Cambridge: Cambridge University Press, 1983, s. 767–768. ISBN 978-0-521-24693-4.; C.E. Bosworth: Khurāsān. W: C.E. Bosworth, E. Van Donzel, B. Lewis, Ch. Pellat: The Encyclopaedia of Islam. New Edition. Volume V. Leiden: E.J. Brill, 1986, s. 56. ISBN 90-04-07819-3.