Simon & Schuster, 1999
Buku Teks
by Samuel C. Brownstein [and others]
Barron's, 1994
Buku Teks
Lindeburg, Michael R.
Professional Publications, 2000
Buku Referensi
Brown, Larry Dale
Research and Education Association, 1994
Buku Teks
Malibu, 1990
Buku Teks