Cita APA (7th ed.)

Brooks, W. (1988). Hingh impact selling. Prentice Hall.

Cita Chicago (17th ed.)

Brooks, William. Hingh Impact Selling. New Delhi: Prentice Hall, 1988.

Cita MLA (9th ed.)

Brooks, William. Hingh Impact Selling. Prentice Hall, 1988.