phonetics

Kelly. G. (2004) “How to Teach Pronunciation”. Longman Publishing.

CRYSTAL .D. (1987) “The Cambridge Encyclopedia of Language”. Cambridge: Cambridge University Press. [part IV: The medium of language: Speaking and Listening]

Catford, J. C. (1968) ” The articulatory possibilities of man”. In B. Malmberg (Ed.), Manual of phonetics (pp. 309-334). Amsterdam: North Holland

Catford, J. (1982)“Fundamental problems in phonetics” (2nd ed.). Edinburgh: Edinburgh University Press. (Original work published 1977)

BLACK, J.W. (1983) "Speech: Phonetics in the United States", The Phonetician CL-38: 20-21.