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1. King, W. F. and Cree, D. Ann. 1986. English Business Letters. New Edition, Revised by David O'Gormon. London: Longman
2. Gartside, L. 1979. Model Business Letters. London: Mc Donald and Evans Ltd.
3. Bowman. Joel P. and Branchaw, Bernadine P. 1980. Successful Communication in Business. San Fransisco: Harper and Row.
4. Knapper, Arno F. and Newcomb, Loda I. 1980. A Style Mannual for Written Communication. Columbus, Ohio: Grid Publishing.
2. Gartside, L. 1979. Model Business Letters. London: Mc Donald and Evans Ltd.
3. Bowman. Joel P. and Branchaw, Bernadine P. 1980. Successful Communication in Business. San Fransisco: Harper and Row.
4. Knapper, Arno F. and Newcomb, Loda I. 1980. A Style Mannual for Written Communication. Columbus, Ohio: Grid Publishing.
