Davis, Bill, author
Addison-Wesley, 1994
Buku Teks
Stroyan, K.D.
Academic Press, 1993
Buku Teks
Kerckhove, Michael G.
McGraw-Hill, 1993
Buku Teks
Mesenas, Geraldine, author
Gareth Stevens, 2001
Buku Teks
Varberg, Dale E., author
Pearson - Prentice Hall, 2007
Buku Teks