Scholes, Percy A.
Oxford University Press, 1933
Buku Referensi
Oxford Univesity Press, 2008
Buku Referensi
edited by Peter France
Clarendon Press, 1995
Buku Referensi
Walker, David M.
Clarendon Press, 1980
Buku Referensi
editor, Tom McArthur ; managing editor, Feri McArthur
Oxford University Press, 1992
Buku Referensi