Gaya APA
Drucker, Peter F. (2011).
ON LEADERSHIP .
America:
Harvard Business School Publishing.
Gaya Chicago
Drucker, Peter F.
ON LEADERSHIP.
America:
Harvard Business School Publishing,
2011.
Text.
Gaya MLA
Drucker, Peter F.
ON LEADERSHIP.
America:
Harvard Business School Publishing,
2011.
Text.
Gaya Turabian
Drucker, Peter F.
ON LEADERSHIP.
America:
Harvard Business School Publishing,
2011.
Print.