Seaton, A.V., author
International Thomson Businees Press, 1996
Buku Teks
David, Fred R., author
Pearson, 2009
Buku Teks
Thompson, Arthur A., 1940-, author
Irwin, 1996
Buku Teks
Wheelen, Thomas L., author
Addison-Weley Publishing , 1990
Buku Teks
Bursk, Edward Collins, author
Prentice-Hall, 1975
Buku Teks