↑Area handbook for Iran
By Harvey Henry Smith, American University (Washington, D.C.). Foreign Area Studies, American University (Washington, D.C.). Foreign Areas Studies, page 89
↑Academic American Encyclopedia By Grolier Incorporated, page 294
↑The World Book Encyclopedia
By World Book, Inc, 2000, page 401
↑
Dalb, Andrew (1998). Dictionary of Languages: The Definitive Reference to More Than 400 Languages. [S.l.]: Columbia University Press. p. 226. ISBN0-231-11568-7
↑Bilingualism in Mazandaran: Peaceful Coexistence With Persian by Maryam Borjian, Columbia University, Page 66. Online Access: [1]Arquivado em 21 de setembro de 2006, no Wayback Machine.
