CQ Press, 1985
Buku Teks
Congressional Quarterly, 1980
Buku Teks
Herrnson, Paul S., author
CQ Press, 2004
Buku Teks
Jongkon Lee, author
Seoul National University, 2019
Artikel Jurnal
Schmeckebier, Laurence F.
The Brookings Institution, 1941
Buku Teks