Eckes, George, author
McGraw-Hill, 2005
Buku Teks
Brue, Greg, author
McGraw-Hill, 2006
Buku Teks
Breyfogle, Forrest W., author
John Wiley & Sons, 2001
Buku Teks
Manajemen Usahawan Indonesia, XXXII (01) Januari 2003: 47-49, 2003
Artikel Jurnal
Gygi, Craig, author
Wiley, 2006
Buku Teks