Ario Sampurno, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2004
UI - Tesis Membership
Bardi, James A., author
John Wiley & Sons, 2007
Buku Teks
Go, Frank M.
Routledge , 1995
Buku Teks
Baker, Sue, author
Continuum, 2000
Buku Teks
Devy Saviatry Nazahar, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1985
UI - Skripsi Membership