Rujukan Vokal_bundar_depan_sempit

  1. ↑ Szende, Tamás (1994), "Illustrations of the IPA:Hungarian", Journal of the International Phonetic Alphabet, 24 (2): 91–94 
  2. ↑ Fougeron, Cecile; Smith, Caroline L (1993), "Illustrations of the IPA:French", Journal of the International Phonetic Association, 23 (2): 73–76