Gaya APA
Drucker, Peter F. (2001).
Management Challenges for the 21st Century (Ed. 1).
New York:
HarperBusiness.
Gaya Chicago
Drucker, Peter F.
Management Challenges for the 21st Century.
Ed. 1
New York:
HarperBusiness,
2001.
Text.
Gaya MLA
Drucker, Peter F.
Management Challenges for the 21st Century.
Ed. 1
New York:
HarperBusiness,
2001.
Text.
Gaya Turabian
Drucker, Peter F.
Management Challenges for the 21st Century.
Ed. 1
New York:
HarperBusiness,
2001.
Print.