Keir, D. L. (David Lindsay), author
Oxford, 1959
Buku Teks
Dine, Janet, author
Blackstone Press, 1998
Buku Referensi
Morris, J.H.C.
At The Clarendon Press, 1968
Buku Teks
Post, Gordon C.
The Liberal Arts Press, 1957
Buku Teks
Beatson, J.
Claredon Press, 1983
Buku Teks