Hirshberg, Herbert S.
Subject guide to United States government publications
American Library Association, 1947
 Buku Teks SO
Boyd, Anne Morris
United states government publications
H.W. Wilson, 1949
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The United States government Internet manual
edited by Peggy Garvin
Bernan Press, 2004
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Walker, Edward Everett, 1900-1974
Government of the United States
Charles Scribner's Sons, 1943
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Zink, Harold
Government of cities in the United States
Macmillan, 1948
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