Bibliografi Vokal_tak_bundar_belakang_separuh_luas

  • Gordon, Matthew (2004a), "New York, Philadelphia and other Northern Cities", dalam Kortmann, Bernd; Schneider, Edgar W., A Handbook of Varieties of English: Volume 1: Phonology, Walter de Gruyter, m/s. 294–296, ISBN 3110175320 
  • Gordon, Matthew (2004b), "The West and Midwest: phonology", dalam Kortmann, Bernd; Schneider, Edgar W., A Handbook of Varieties of English: Volume 1: Phonology, Walter de Gruyter, m/s. 340, ISBN 3110175320 
  • Jones, Daniel (1972). An outline of English phonetics (edisi 9th). Cambridge: W. Heffer & Sons Ltd. 
  • Roca, Iggy; Johnson, Wyn (1999). Course in Phonology. Blackwell Publishing. 
  • Thomas, Erik R. (2001), "An acoustic analysis of vowel variation in New World English", Publication of the American Dialect Society, Duke University Press for the American Dialect Society, 85, ISSN 0002-8207 
  • Tillery, Jan and Guy Bailey, "The urban South: phonology", dalam Kortmann, Bernd; Schneider, Edgar W., A Handbook of Varieties of English: Volume 1: Phonology, Walter de Gruyter, m/s. 333, ISBN 3110175320  Teks "year-2004

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