APA
Hellriegel D., . (1999). Management 8th ed. [Place of publication not identified]: Southwestern Publishing Group.
Chicago
Hellriegel Don, . 1999. Management 8th ed. [Place of publication not identified]: Southwestern Publishing Group.
Harvard
Hellriegel D., . (1999). Management 8th ed. [Place of publication not identified]: Southwestern Publishing Group.
MLA
Hellriegel Don, . Management 8th ed. [Place of publication not identified]: Southwestern Publishing Group. 1999.