Baker, Ross K., author
Friend and Foe In the U.S. Senate
Free Press, 1980
 Buku Teks
Slater, Ralph P., author
With sword and plow : the role of the American military in contemporary society
Frederick A. Praeger, 1968
 Buku Teks
Public opinion and Congressional elections / edited by William N. McPhee & William A. Glaser.
Greenwood Press, 1981
 Buku Teks
Fox, Harrison W.
Congressional staffs : the invisible force in American lawmaking / Harrison W. Fox
The Free Press, 1977
 Buku Teks
Barone, Michael, author
The almanac of American politics 1990
National Journal, 1992
 Buku Referensi
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