Phelan, Peter, author
Routledge, 1996
Buku Teks
by Bruce L. Brown [and others]
John Wiley & Sons, 2012
Buku Teks
Abrami, Philip C., author
Allyn and Bacon, 2001
Buku Teks
Haeussler, Ernest F., author
Prentice-Hall, 2011
Buku Teks
Haeussler, Ernest F., author
Prentica-Hall, 1993
Buku Teks