Bardi, James A., author
John Wiley & Sons, 2007
Buku Teks
Baker, Sue, author
Continuum, 2000
Buku Teks
Ario Sampurno, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2004
UI - Tesis Membership
Go, Frank M.
Routledge , 1995
Buku Teks
Indro Yuwono, author
Universitas Indonesia, 1995
UI - Tesis Membership