DJVU PDF Jahangiri, N. 1996, "Language change in time and space", in The Fourth International Symposium on Language and Linguistics, Thailand, pp. 1906-1914. Institute of Language and Culture for Rural Development, Mahidol University. cite.

DJVU PDF Jahangiri, N. 1992, "Some sociolinguistic aspects of Persian language", in The Third International Symposium on Language and Linguistics, Bangkok, Thailand, pp. 1393-1407. Chulalongkorn University. cite.