Cita APA (7a ed.)

Heller, R. (1999). DK Essential Managers. DK Pub..

Cita Chicago Style (17a ed.)

Heller, Robert. DK Essential Managers. London: DK Pub., 1999.

Cita MLA (8a ed.)

Heller, Robert. DK Essential Managers. DK Pub., 1999.