edited by Robert Gilpin and Christopher Wright
Columbia University Press , 1965
Buku Teks
Stein, Theodore J., author
Columbia University Press, 2001
Buku Teks
de Vries, Michiel S.., author
Palgrave Macmillan , 2010
Buku Teks
Roe, Michael, 1954-, author.
Springer, 2013
Buku Teks
edited by Maurice Mullard
Routledge, 1995
Buku Teks