Bibliografi Vokal_bundar_pusat_sempit

  • Abdel-Massih, Ernest T. (1971). A Reference Grammar of Tamazight. Ann Arbor: University of Michigan. 
  • Jones, Daniel & Ward Dennis (1969), The Phonetics of Russian, Cambridge University Press
  • Matthews, William (1938), written at Detroit, Cockney, Past and Present: a Short History of the Dialect of London, Gale Research Company
  • Przedlacka, Joanna (2001), "Estuary English and RP: Some Recent Findings", Studia Anglica Posnaniensia 36: 35-50
  • Watson, Kevin (2007), "Liverpool English", Journal of the International Phonetic Association 37 (3): 351-360