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
Holloway, William Vernon
State and local government in the United States
McGraw-Hill , 1951
 Buku Teks
The United States government Internet manual.
MD : Bernan Press, 2004
 Buku Teks SO
The United States government Internet manual.
MD : Bernan Press, 2004
 Buku Teks SO