The Brookings Institution, 1961
Buku Teks
DiClerico, Robert E., author
McGraw-Hill, 1984
Buku Teks
White, Theodore H., author
Atheneum Publishers, 1964
Buku Teks
Davis, James W., Jr., author
Greenwood Press, 1980
Buku Teks
edited by Arnold J. Meltsner
Institute for Contemporary Studies, 1981
Buku Teks