Solomon, Lewis D.
Little, Brown and Company, 1994
Buku Teks
Solomon, Lewis D.
West Publishing Co, 1993
Buku Referensi
Burke, D. Barlow
The Michie Company, 1993
Buku Teks
Lewis, Stephen
Oxford University Press, 1984
Buku Teks
Solomon, Eldra Pearl, author
Saunders College, 1995
Buku Teks