McConnell, Charles R.
Jones & Bartlett Learning, 2013
Buku Referensi
Pynes, Joan
Jossey-Bass, 2011
Buku Teks
Metzger, Norman
1978,
Buku Teks
Chatburn, Robert L.
Jones & Bartlett Learning, 2011
Buku Teks
James A. Johnson
Southern Public Administration Education Foundation, Inc, 1990
Majalah, Jurnal, Buletin