Bonner, Thomas Neville
Prentice-Hall, 1963
Buku Teks
Edited by Kader Asmal, Davud Chidester, Wilmot James
Abacus, 2013
Buku Teks
Gray, Richard, 1944-
Longman, 1991
Buku Teks
Berkowitz, Gerald M.
Longman, 1994
Buku Teks
Happold, F.C.
Christophers, 1938
Buku Klasik