Cita APA (7a ed.)

Drucker, P. F. (1959). Landmarks of tomorrow. Harper & Brothers.

Cita Chicago Style (17a ed.)

Drucker, Peter Ferdinand. Landmarks of Tomorrow. New York: Harper & Brothers, 1959.

Cita MLA (9a ed.)

Drucker, Peter Ferdinand. Landmarks of Tomorrow. Harper & Brothers, 1959.