Cita APA (7th ed.)

Heller, R. (2000). Peter Drucker (NA.). Dorling Kindersley.

Cita Chicago (17th ed.)

Heller, Robert. Peter Drucker. NA. London: Dorling Kindersley, 2000.

Cita MLA (9th ed.)

Heller, Robert. Peter Drucker. NA. Dorling Kindersley, 2000.