- Sir Richard Paget, Human speech, 1930, pp. 132–196.
- Maurice Grammont, Traité de phonétique, 3rd edition, 1946, pp. 384–424.
- M. M. Macdermott, Vocal sounds in poetry, 1940, pp. 89–90.
- Op. cit., loc. cit.
- On arithmetical frequency scale.
- Visible speech, 1947, p. 34, etc.
- Acoustic phonetics (Supplement to Language: Language monograph no. 23, April-June 1948), 2.46.
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