Cita APA (7th ed.)

Heller,Robert, & Hindle,Tim. (2008). Selling successfully. Dorling Kindersley.

Cita Chicago (17th ed.)

Heller,Robert, i Hindle,Tim. Selling Successfully. London: Dorling Kindersley, 2008.

Cita MLA (8th ed.)

Heller,Robert, i Hindle,Tim. Selling Successfully. Dorling Kindersley, 2008.