Brendan C. Nolan, editor
Palgrave Macmillan, 2001
Buku Teks
Self, Peter
George Allen & Unwin, 1974
Buku Teks
Fesler, James W. [James William], 1911-2005
Chatam House, 1991
Buku Teks SO
edited by Samuel J. Bernstein
Pergamon Press, 1976
Buku Teks SO
Heady, Ferrel
Marcel Dekker, 1991
Buku Teks SO