References/further recommended reading
• J.C. Wells: Accents of English, volumes 1, 2 & 3, Cambridge University Press 1998
• Arthur Hughes and Peter Trudgill: English Accents and Dialects, Oxford University Press Inc., 1996 Third Edition.
• Patricia Ashby: Speech Sounds, Routledge
• International Phonetic Association http://www.arts.gla.ac.uk/IPA/index.html