Button, John, author
Cassell, 1995
Buku Referensi
Dollin, Stuart, author
The Templar Company, 1992
Buku Referensi
Calkins, Meg
Wiley , 2012
Buku Referensi
Blose, Nora, author
Sterling Publishing, 1993
Buku Referensi
Christman, Christine
Prentice-Hall, 1991
Buku Teks