APA (7e ed.) Bronvermelding

Linton, I. (1997). 30 minutes - to write sales letters. Kogan Page.

Chicago (17e ed.) Bronvermelding

Linton, Ian. 30 Minutes - to Write Sales Letters. New Delhi: Kogan Page, 1997.

MLA (8e ed.) Bronvermelding

Linton, Ian. 30 Minutes - to Write Sales Letters. Kogan Page, 1997.