1. Levelt, W. J. M. Speaking: From Intention to Articulation (MIT Press, 1993)
2. Ladefoged, P. & Johnson, K. A Course in Phonetics (Wadsworth Publishing, 2010)
3. Browman, C. P. & Goldstein, L. Articulatory gestures as phonological units. Haskins Laboratories Status Report on Speech Research 99, 69–101 (1989)
4. Fowler, C. A., Rubin, P. E., Remez, R. E. & Turvey, M. T. in Language Production: Speech and Talk Vol. 1 (ed. Butterworth, B. ) 373–420 (Academic Press, 1980)
5. Gracco, V. L. & Lofqvist, A. Speech motor coordination and control: evidence from lip, jaw, and laryngeal movements. J. Neurosci. 14, 6585–6597 (1994)