Kench, A. (1973). The language of English Business Letters (1st.). Macmillan Education Ltd.
Citazione stile Chigago Style (17a edizione)Kench, A. The Language of English Business Letters. 1st. London: Macmillan Education Ltd, 1973.
Citatione MLA (9a ed.)Kench, A. The Language of English Business Letters. 1st. Macmillan Education Ltd, 1973.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.