Hall, Peter
Routledge, 2011
Buku Teks
Freeman, T.W.
Hutchinson University Library, 1974
Buku Teks SO
edited by Andrew Blowers and Bob Evans
Routledge, 1997
Buku Teks
Davidson, Joan
Pergamon Press, 1977
Buku Teks SO
Evans, Bob
Ashgate, 1995
Buku Teks SO