Garland, Henry, author
Oxford University Press, 1995
Buku Referensi
edited by Denis Arnold
Oxford University Press, 1992
Buku Referensi
Scholes, Percy A., author
Oxford University Press, 1933
Buku Referensi
Walker, David M., author
Clarendon Press, 1980
Buku Referensi
Johson, Bruce, author
Oxford University Press, 1987
Buku Teks