edited by Steven Moorhead and Gordon Grice
Rockport Publisher, 1997
Buku Referensi
Walker, Peter, author
MIT Press, 1998
Buku Teks
Walker, Peter, author
MIT Press, 1998
Buku Teks
Fleming, John, author
Penguin , 1999
Buku Referensi
edited by Catherine Spellman
Actar, 2003
Buku Teks