Nguồn tham khảo Dãy_phương_ngữ

  1. ↑ Bloomfield, Leonard (1935). Language. London: George Allen & Unwin. tr. 51. 
  2. ↑ Hockett, Charles F. (1958). A Course in Modern Linguistics. New York: Macmillan. tr. 324–325. 
  3. ↑ Cruse, D.A. (1986). Lexical Semantics. Cambridge: Cambridge University Press. tr. 71. ISBN 978-0-521-27643-6. 
  4. ↑ Chambers, J.K.; Trudgill, Peter (1998). Dialectology (ấn bản 2). Cambridge University Press. tr. 13–19, 89–91. ISBN 978-0-521-59646-6.