Morehead, Joe, author
Introduction to United States public documents
Libraries Unlimited, 1978
 Buku Teks
Nichols, Jeannette P., author
Twentieth century United States : a history
D. Appleton-Century, 1943
 Buku Teks
McGovern, Edmond, author
International trade regulation: GATT, The United States and the European Communiny
Globefield Press, 1982
 Buku Teks
Holloway, William Vernon, author
State and local government in the United States
McGraw-Hill , 1951
 Buku Teks
Maxwell, James A., author
The fiscal impact of federalism in United States
Harvard University Press, 1946
 Buku Teks
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