Wilson, Woodrow
Constitutional government in the United States / Woodrow Wilson
Columbia University, [date of publication not identified]
 Buku Teks
Cosgrove, John J.
Australian government : its history and how it works
Longman, 1988
 Buku Teks
Austin, Erik W.
Political facts of the united states since 1789 / Erik W. Austin
Columbia University Press, 1986
 Buku Teks
Walker, Edward Everett, 1900-1974
Government of the United States
Charles Scribner's Sons, 1943
 Buku Teks
The United States of America : a government by the people
The America University, [date of publication not identified]
 Buku Teks