APA (7th ed.) Citation

Beatty, J., & Drucker, P. F. (1998). The world according to Peter Drucker. The Free Press.

Chicago Style (17th ed.) Citation

Beatty, Jack, and Peter F. Drucker. The World According to Peter Drucker. New York: The Free Press, 1998.

MLA (9th ed.) Citation

Beatty, Jack, and Peter F. Drucker. The World According to Peter Drucker. The Free Press, 1998.