Hooker, M. B., author
Oxford University Press, 1976
Buku Teks
Roeder, O. G., author
Gramedia Book, 1987
Buku Teks
Williams, Numan A., author
South Western , 1984
Buku Teks
O`Dell, Jerry W., author
TAB Books, 1984
Buku Teks
Grundy, Fred, author
H.K. Lewis, 1968
Buku Teks