Darling, Frank C.
G.K Hall & co., 1979
Buku Teks
edited by Robert O. Keohane and Helen V. Milner
Cambridge University Press, 1996
Buku Teks
Pollit, Christopher, author
Oxford University press, 2000
Buku Teks
Field, G. Lowell, author
Cornell University Press, 1967
Buku Teks
Meny, Yves
Oxford University Press, 1998
Buku Teks