Cain, Brian
Grolier International, 1999
Buku Teks
Oka A. Yoeti, author
Infobank, 1997
Buku Teks
Kasmir, author
Kencana Prenada Media, 2004
Buku Teks
Rose, Peter S., author
McGraw-Hill Irwin, 2002
Buku Teks
Nugroho, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2004
UI - Tesis (Membership)