Cache, Bernard, author
MIT Press, 1995
Buku Teks
Press, Frank, author
W H Freeman , 1974
Buku Teks
edited by Gabriel Brahm, Marrk Driscoll
Westview Press , 1995
Buku Teks
Maitland-Jones, J.F., author
W.W. Norton, 1974
Buku Teks
The Ministry of Foreign Affair, 1977
Buku Teks