Oliver, M.C., author
Pitman, 1994
Buku Referensi
Smith, Kenneth, author
Pitman, 1975
Buku Teks
Altschuler, Bruce E., author
Prentice-Hall, 1996
Buku Teks
Pinto, Arthur R., author
LexisNexis, 2009.
Buku Teks
Clarkson, C. M. V., author
Fontana , 1995
Buku Teks