Gaya APA
DRUCKER, Peter F. (2001).
The Essential Drucker .
New York:
Harpercollins.
Gaya Chicago
DRUCKER, Peter F.
The Essential Drucker.
New York:
Harpercollins,
2001.
Text.
Gaya MLA
DRUCKER, Peter F.
The Essential Drucker.
New York:
Harpercollins,
2001.
Text.
Gaya Turabian
DRUCKER, Peter F.
The Essential Drucker.
New York:
Harpercollins,
2001.
Print.