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Hewlett, Nigel and Beck, Janet (2006) An introduction to the science of phonetics. Lawrence Erlbaum Associates, Mahwah NJ: . ISBN 978-0805856729
Beck, Janet (2005) Perceptual analysis of voice quality: the place of Vocal Profile Analysis. In: A Figure of Speech: a Festchrift for John Laver. Laurence Erlbaum, London, pp. 285-322. ISBN 0805845283