Gutzwiller, Kathryn J., author
Blackwell, 2007
Buku Teks
edited by Ian Ousby
Cambridge University Press, 1993
Buku Referensi
edited by Ian Qusby
Cambridge University Press, 1988
Buku Referensi
Barnett, Andrew H., author
Richard D. Irwin, 1982
Buku Teks
Wilson, Billie Ann, author
Prentice-Hall, 2003
Buku Teks