O`Connell, Jeffrey
Commerce Clearing House, 1971
Buku Teks
edited by William F. Bluhm, Daniel D. Skwire, Stephen J. Kaczmarek and Kristi M. Bohn
ACTEX Publications, 2012
Buku Teks
Munch, James C.
Little, Brown and Company, 1981
Buku Teks
Dobbyn, John F.
West Publishing, 1989
Buku Teks
Dobbyn, John F.
West Publishing, 1996
Buku Teks