(en)Lambton, Ann K. S. (1988). Continuity and Change in Mediaeval Persia: Aspects of Administrative, Economic and Social History, 11th-14th Centuries. Columbia Lectures on Iranian Studies. 2. Albany, New York: SUNY Press; Bibliotheca Persica. str. 183. ISBN9780887061349. OCLC883361879.
(en)Melville, C. P. (1999). The Fall of Amir Chupan and the Decline of the Ilkhanate, 1327-1337: A Decade of Discord in Mongol Iran. Papers on inner Asia. 30. Bloomington, Indiana: Indiana University, Research Institute for Inner Asian Studies. str. 24. ISSN0893-1860. OCLC42210826.
(en)Pedro, Jose O. (1999). Arch Dams: Designing and Monitoring for Safety. Courses and Lectures. 367. Wien; New York: Springer. str. 11-12. ISBN9783211831496. OCLC43610307.