Cita APA (7a ed.)

Drucker, P. F. (1967). The effective executive. Harper & Row.

Cita Chicago Style (17a ed.)

Drucker, Peter Ferdinand. The Effective Executive. New York [etc.]: Harper & Row, 1967.

Cita MLA (9a ed.)

Drucker, Peter Ferdinand. The Effective Executive. Harper & Row, 1967.