1. Acoustic–phonetic contrasts and intelligibility in the dysarthria associated with mixed cerebral palsy;Ansel;Journal of Speech and Hearing Research,1992
2. Barton, D. (1976). The role of perception in the acquisition of phonology. Doctoral dissertation, University of London.
3. The discrimination of minimally-different pairs of real words by children aged 2;3 to 2;11;Barton,1978
4. Articulation and phonological disorders;Bernthal,1998
5. Language;Bloomfield,1933