Neustadt, Richard E., author
The Free Press, 1990
Buku Teks
Simon & Schuster, 1995
Buku Teks
Fersh, Seymour H., author
Public Affairs, 1961
Buku Teks
Neustadt, Richard E., author
John Wiley & Sons, 1961
Buku Teks
Edwards, George C., author
Thomson, 2006
Buku Teks