Palmer, E.H., author
Routledge & Kegan Paul, 1956
Buku Referensi
Boyle, John Andrew, author
Luzac & Company, 1949
Buku Referensi
Skeat, Walter W., author
The Clarendon Press, 1948
Buku Referensi
David B. Guralnik, general editor
The World Publishing Co., 1956
Buku Referensi
Bird, Roger
Sweet & Maxwell, 1983
Buku Teks