APA (7th ed.) Citation

Drucker, P. F. (1959). Landmarks of tomorrow ([1st ed.].). Harper.

Chicago Style (17th ed.) Citation

Drucker, Peter F. Landmarks of Tomorrow. [1st ed.]. New York: Harper, 1959.

MLA (9th ed.) Citation

Drucker, Peter F. Landmarks of Tomorrow. [1st ed.]. Harper, 1959.