Brown, Seyon
Columbia University Press, 1968
Buku Teks
Brown, Seyom
Brookings institution Press, 2003
Buku Teks
Rosati, Jerel A., 1953-
Wadsworth, 2007
Buku Teks
Rosati, Jerel A., 1953-
Thomson, 2004
Buku Teks
edited by Robert W. Tucker, Charles B. Keely, and Linda Wrigley
Westview Press, 1990
Buku Teks