Kydd, Andrew H., 1963-
Cambridge University Press, 2015
Buku Teks
Spero, Joan Edelman
Routledge , 1997
Buku Teks
Spero, Joan Edelman
Wadsworth, 2010
Buku Teks
Hodgson, John S.
Prentice-Hall, 1983
Buku Teks
Gilpin, Robert
Princeton University Press, 1987
Buku Teks