Kumar, Krishan, author
Blackwell, 1996
Buku Teks
Martin, Stephen, 1961-, author
Blacwell Publisher, 2002
Buku Teks
Ramage, Douglas E.
Routledge , 1997
Buku Teks
Carr, E.H. (Edward Hallet), author
Beacon Pers, 1951
Buku Teks
Fisher, Douglas
St. Martin's Press, 1992
Buku Teks