Zinn, Howard
A People s History of the United States
HarperCollins Publishers, 2005
 Buku Teks
Walker, Edward Everett, 1900-1974
Government of the United States
Charles Scribner's Sons, 1943
 Buku Teks
Boyd, Anne Morris
United states government publications
H.W. Wilson, 1949
 Buku Teks
The Encyclopedia of U.S. Government benefits : a complete, practical and convenient guide to United States Government benefits available to the people of America / written by a group of Government experts;
edited by Roy A. Grisham, Jr., Paul D. McConaughy
WM. H. Wise, 1966
 Buku Referensi
Holloway, William Vernon
State and local government in the United States
McGraw-Hill , 1951
 Buku Teks