Mingst, Karen A., author
W.W. Norton, 2004
Buku Teks
Mingst, Karen A., author
Norton & Company, 2014
Buku Teks
Griffith, Martin, author
Routledge, 2002
Buku Teks
edited by Beth A. Simmons and Richard H. Steinberg
Cambridge University Press, 2006
Buku Teks
Deutsch, Karl Wolfgang, 1912-1992, author
Prentice-Hall, 1988
Buku Teks