APA

Drucker P. F., . (1993). The practice of management. New York: Harper Business.

Chicago

Drucker Peter Ferdinand, . 1993. The practice of management. New York: Harper Business.

Harvard

Drucker P. F., . (1993). The practice of management. New York: Harper Business.

MLA

Drucker Peter Ferdinand, . The practice of management. New York: Harper Business. 1993.