Cotsakos, Christos M., author
Harper Business, 2000
Buku Teks
Charlene Davis
Entrepreneur Press, 2012
Buku Teks
Fong, Wai Mun, author
McGrawHill, 2004
Buku Teks
Speinkel, Beryl W., author
Dow Jones-Irwin, 1977
Buku Teks
Morris, Kenneth M., author
Lightbulb Press, 1998
Buku Referensi