Gaya APA
Gardner, John W.. (1990).
On Leadership .
New York:
The Free Press.
Gaya Chicago
Gardner, John W..
On Leadership.
New York:
The Free Press,
1990.
Text.
Gaya MLA
Gardner, John W..
On Leadership.
New York:
The Free Press,
1990.
Text.
Gaya Turabian
Gardner, John W..
On Leadership.
New York:
The Free Press,
1990.
Print.