Moverley, John, author
Harper-Collins, 1986
Buku Teks
Long, Larry E., author
Prentice-Hall, 1992
Buku Referensi
Osborne, Adam, author
McGraw-Hill, 1983
Buku Teks
Craine, J. Ffynlo, author
Addison-Wesley, 1985
Buku Teks
Capron, H.L., author
The Benjamin / Cumming Publishing Company Inc., 1989
Buku Teks