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.
Buku.
Gaya MLA
Gardner, John W.
On leadership.
New York:
The Free Press,
1990.
Buku.
Gaya Turabian
Gardner, John W.
On leadership.
New York:
The Free Press,
1990.
Buku.