APA

Drucker P. F., . (1985). Management: tasks, responsibilities, practices. New York: Harper Colophon Books.

Chicago

Drucker Peter Ferdinand, . 1985. Management: tasks, responsibilities, practices. New York: Harper Colophon Books.

Harvard

Drucker P. F., . (1985). Management: tasks, responsibilities, practices. New York: Harper Colophon Books.

MLA

Drucker Peter Ferdinand, . Management: tasks, responsibilities, practices. New York: Harper Colophon Books. 1985.