APA (7th ed.) Citation

Drucker, P. (2003). The essential Drucker. Harper Collins Pub.

Chicago Style (17th ed.) Citation

Drucker, Peter.F. The Essential Drucker. New York: Harper Collins Pub, 2003.

MLA (9th ed.) Citation

Drucker, Peter.F. The Essential Drucker. Harper Collins Pub, 2003.

Warning: These citations may not always be 100% accurate.