APA

Drucker P. F., .Managing for results economic tasks and risk-taking decisions. New York: Harper & Row.

Chicago

Drucker Peter F, .Managing for results economic tasks and risk-taking decisions. New York: Harper & Row.

Harvard

Drucker P. F., .Managing for results economic tasks and risk-taking decisions. New York: Harper & Row.

MLA

Drucker Peter F, .New York: Harper & Row. .