Dixon, Martin
Blackstone Press, 1993
Buku Teks
Visscher, Charles de, author
Princeton University Press, 1957
Buku Teks
Ross, Alf, author
Longmans, Green , 1947
Buku Teks
Oppenheim, L., author
Longmas, Green , 1921
Buku Teks
Mann, F.A.
Clarendon Press, 1973
Buku Teks