APA

Drucker P. F., heinemann professional publishing, . (1989). The practice of management. oxford: heinemann professional publishing.

Chicago

Drucker Peter F, heinemann professional publishing, . 1989. The practice of management. oxford: heinemann professional publishing.

Harvard

Drucker P. F., heinemann professional publishing, . (1989). The practice of management. oxford: heinemann professional publishing.

MLA

Drucker Peter F, heinemann professional publishing, . The practice of management. oxford: heinemann professional publishing. 1989.