Westing, John Howard, author
Macmillan, c1975
Buku Teks
Routledge, 2000
Buku Teks
Sankar Muthu
Cambridge University Press, 2014
Buku Teks
Brinton, Crane, 1898-1968, author
Prentice-Hall, 1963
Buku Teks SO
Rachman, David J., author
Dryden Press, 1980
Buku Teks