Tham khảo Great_Vowel_Shift

  1. ↑ Stockwell, Robert (2002). “How much shifting actually occurred in the historical English vowel shift?” (PDF). Trong Minkova, Donka; Stockwell, Robert. Studies in the History of the English Language: A Millennial Perspective (PDF)|định dạng= cần |url= (trợ giúp). Mouton de Gruyter. ISBN 3-11-017368-9. 
  2. ↑ Wyld, H. C. (1957) [1914], A Short History of English 
  3. ↑ Denham, Kristin; Lobeck, Anne (2009), Linguistics for Everyone: An Introduction, Cengage Learning, tr. 89 
  4. ↑ William Labov (1994). Principles of Linguistic Change. Blackwell Publishing. pp. 145. ISBN 0-6311-7914-3.