Jones, Douglas Samuel, author
Oxford University Press, 1988
Buku Teks
Duncan, FG., author
Prentice-Hall, 1979
Buku Teks
Duncan, F.G., author
Prentice-Hall, 1979
Buku Teks SO
Erskine, Robert, author
Elex Media Komputindo, 1987
Buku Teks SO
Streitmatter, Gene A., author
Reston Publishing, 1981
Buku Teks