APA

Drucker P. F., . (1954). The practice of management. New York: Harper.

Chicago

Drucker Peter Ferdinand, . 1954. The practice of management. New York: Harper.

Harvard

Drucker P. F., . (1954). The practice of management. New York: Harper.

MLA

Drucker Peter Ferdinand, . The practice of management. New York: Harper. 1954.