Mendelsohn, Ronald S.
George Allen& Unwin , 1979
Buku Teks
Jones, M.A.
George Allen& Unwin , 1983
Buku Teks
Kennedy, Richard
Macmillan Publishing Co. Inc, 1982
Buku Teks
F.W. Cheshire, 1967
Buku Teks
Dobelstein, Andrew W., author
Wadsworth, 2003
Buku Teks