Gershevitch, I.; Fisher, William Bayne; Boyle, John Andrew; Yarshater, Ehsan; Frye, Richard Nelson (1985). The Cambridge History of Iran (dalam bahasa Inggris). Cambridge University Press. hlm. 372. ISBN9780521200912.
Gershevitch, I.; Fisher, William Bayne; Boyle, John Andrew; Yarshater, Ehsan; Frye, Richard Nelson (1985). The Cambridge History of Iran (dalam bahasa Inggris). Cambridge University Press. hlm. 373. ISBN9780521200912.
Gershevitch, I.; Fisher, William Bayne; Boyle, John Andrew; Yarshater, Ehsan; Frye, Richard Nelson (1985). The Cambridge History of Iran (dalam bahasa Inggris). Cambridge University Press. hlm. 374. ISBN9780521200912.