Jones, D. S. (Douglas Samuel), author
Oxford University Press, 1988
Buku Teks
Duncan, F.G., author
Prentice-Hall, 1979
Buku Teks
Duncan, FG., author
Prentice-Hall, 1979
Buku Teks
Erskine, Robert, author
Elex Media Komputindo, 1987
Buku Teks
Andrews, Michael, 1940-
Buku Teks