Cita APA (7th ed.)

Hart, G. (1997). 30 minutes...to succeed in business writing. Kogan Page Limited.

Cita Chicago (17th ed.)

Hart, Graham. 30 Minutes...to Succeed in Business Writing. London: Kogan Page Limited, 1997.

Cita MLA (9th ed.)

Hart, Graham. 30 Minutes...to Succeed in Business Writing. Kogan Page Limited, 1997.