APA
Drucker P. F., . (1986). Managing for results : economic tasks and risk-taking decisions. Harper Business: New York.
Chicago
Drucker Peter F, . 1986. Managing for results : economic tasks and risk-taking decisions. Harper Business: New York.
Harvard
Drucker P. F., . (1986). Managing for results : economic tasks and risk-taking decisions. Harper Business: New York.
MLA
Drucker Peter F, . Managing for results : economic tasks and risk-taking decisions. Harper Business: New York. 1986.