Schlitter, D.A. (2005). Wilson, D.E.; Reeder, D.M. (penyunting). Mammal Species of the World (ed. ke-4). Baltimore, Maryland, Amerika Syarikat: Johns Hopkins University Press. m/s. 842–843. ISBN978-0-8018-8221-0.
iranicaonline.org
A'lam, Hūšang (1989). "Beaver". Encyclopaedia Iranica. IV(1). New York, AS: Universiti Columbia. m/s. 71–74.