Drucker, P. F. (1985). The effective. Haper Business Essentials.
Chicago Style (17th ed.) CitationDrucker, Peter F. The Effective. New York: Haper Business Essentials, 1985.
MLA (9th ed.) CitationDrucker, Peter F. The Effective. Haper Business Essentials, 1985.
Warning: These citations may not always be 100% accurate.