Cita APA (7th ed.)

Kench, A. (1973). The language of English Business Letters (1st.). Macmillan Education Ltd.

Cita Chicago (17th ed.)

Kench, A. The Language of English Business Letters. 1st. London: Macmillan Education Ltd, 1973.

Cita MLA (9th ed.)

Kench, A. The Language of English Business Letters. 1st. Macmillan Education Ltd, 1973.