1Derwing,Munro and Wiebe."Pronuniation Instruction for 'fossilized' learners.Can it help?" Applied Language Learning,1997,8,2:217-35.
2Guiora,Beit-Hallami,Brannon.The effects of experimentally induced changes in ego states on pronunciation ability in second language:An exploratory study.Comprehensive Psychiatry,1972,13:421-28.
3Pennington.Phonology in English language teaching:An international approach.London:Longman,1996.
