Marston, John
Pitman, 1993
Buku Teks
Keir, D. L. (David Lindsay), author
Oxford University Press, 1948
Buku Teks
Keir, D. L. (David Lindsay), author
Oxford, 1959
Buku Teks
Beatson, J.
Claredon Press, 1983
Buku Teks
Post, Gordon C.
The Liberal Arts Press, 1957
Buku Teks