A nation of states : essays on the American federal system
edited by Robert A. Goldwin
Rand McNally, 1963
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Ferguson, John H.
The American federal government
McGraw-Hill, 1981
 Buku Teks
Ferguson, John H.
The American federal goverment
McGraw-Hill, 1961
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Proceedings of the 1983 convention of The American Academy of Advertising
edited by Donald W. Jugenheimer
Kansas American Academy of Advertising, 1983
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Proceedings of the 1984 convention of The American Academy of Advertising
edited by Donald R. Glover
Nebraska American Academy of Advertising, 1984
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