Gaya APA
Drucker, Peter F.. (1999).
Management challenges for the 21st century (Cetakan Pertama).
New York:
HarperCollins.
Gaya Chicago
Drucker, Peter F..
Management challenges for the 21st century.
Cetakan Pertama
New York:
HarperCollins,
1999.
Text.
Gaya MLA
Drucker, Peter F..
Management challenges for the 21st century.
Cetakan Pertama
New York:
HarperCollins,
1999.
Text.
Gaya Turabian
Drucker, Peter F..
Management challenges for the 21st century.
Cetakan Pertama
New York:
HarperCollins,
1999.
Print.