Morris S.Ogul
Prentice-Hall, 1977
Buku Teks
Keefe, William J., author
Prentice-Hall, 1994
Buku Teks
Murphy, Walter F., author
University of Chicago Press, 1962
Buku Teks
editor in-chief, Joel H. Silbey
Charles Scribner`s Sons, Legislative bodies
Buku Referensi
editor in-chief, Joel H. Silbey
Charles Scribner`s Sons, 1994
Buku Referensi