Kench, A. (1973). The language of English Business Letters (1st.). Macmillan Education Ltd.
Lua i Stíl Chicago (17ú heag.)Kench, A. The Language of English Business Letters. 1st. London: Macmillan Education Ltd, 1973.
Lua MLA (9ú heag.)Kench, A. The Language of English Business Letters. 1st. Macmillan Education Ltd, 1973.
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