Coyle, David Cushman, 1887-1969
The United States political system and how it works
A Mentor Book, 1963
 Buku Teks
Adrian, Charles R.
State and local governments / Charles R. Adrian
Mc Graw-Hill, 1976
 Buku Teks
Dye, Thomas R.
Politics in States and Communities/ Thomas R. Dye
Prentice_Hall, Inc, 1988
 Buku Teks
Adrian, Charles R.
Governing our fifty state and their communities
McGraw-Hill , 1978
 Buku Teks
Inside the system: readings from the Washington monthly
edited by Charles Peters and Jonathan Alter
Prentice-Hall, 1985
 Buku Teks