Szeri, A.Z.
New York: McGraw-Hill, [date of publication not identified]
Buku Teks
Billett, Michael, author
Pergamon Press , 1979
Buku Teks
Cameron, Alastair, author
Ellis Horwood, 1981
Buku Teks
Lansdown, A.R., author
Pergamon Press, 1982
Buku Referensi
Lansdown, A.R., author
Pergamon Press, 1982
Buku Referensi