Moore, J.J.
Butterworth, 1981
Buku Teks
Kou, Sindo
John Wiley & Sons, 1987
Buku Teks
Rollason, E.C.
Edward Arnold, 1978
Buku Teks
Peters, Anthony T.
New York: John Wiley & Sons, 1982
Buku Teks
Parker, Roger Hill, author
Pergamon Press, 1983
Buku Teks