Παραπομπή APA

Drucker, P. F. (2008). Classic drucker: Essential wisdom of Peter Drucker from the pages of Harvard Business Review. Harvaed Business.

Παραπομπή Chicago Style

Drucker, Peter F. Classic Drucker: Essential Wisdom of Peter Drucker from the Pages of Harvard Business Review. Boston: Harvaed Business, 2008.

Παραπομπή MLA

Drucker, Peter F. Classic Drucker: Essential Wisdom of Peter Drucker from the Pages of Harvard Business Review. Harvaed Business, 2008.