APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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