^McDonough, Ladefoged & George (1993). Note that the authors gave a narrow transcription of [ɵ], though at the time the IPA had only this one symbol for a mid central rounded vowel, and it is clear from the discussion and formant charts that this vowel a centralized open mid vowel.
McDonough, Joyce; Ladefoged, Peter; George, Helen, Navajo Vowels and Phonetic Universal Tendencies, UCLA Working Papers in Phonetics, Fieldwork Studies of Targeted Languages, 1993, 84: 143–150
Wells, John C. Accents of English. II: The British Isles. Cambridge, New York: Cambridge University Press. 1982a. ISBN 0-521-28541-0.
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