Ireland, Connie Estrada, author
McGraw-Hill, 2011
Buku Referensi
Samaha, Joel, author
West Publishing, 1988
Buku Teks
Cole, George F., author
Brooks/Cole, 1986
Buku Teks
Cox, Steven M., author
McGraw-Hill, 1998
Buku Teks
Alpert, Geoffrey P., author
Sage, 1985
Buku Teks