Martin, Shan
Sage Publications, 1983
Buku Teks
Self, Peter, author
George Allen & Unwin, 1974
Buku Teks
Fesler, James W. (James William), 1911-2005, author
Chatam House, 1991
Buku Teks
edited by Jerri Killian; Niklas Eklund
CRC Press, 2008
Buku Teks
Kearns, Kevin P.
Jossey-Bass Publishers, 1996
Buku Teks