Neely, Matthew, author
Elsevier/Syngress, 2013
Buku Teks
Mill, John Stuart, author
Yayasan Obor Indonesia, 2005
Buku Teks
Untung Nugroho, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2004
UI - Tesis (Membership)
Sully, F.K.
London: Butterworths, 1979
Buku Teks
White, Charles, author
Haynes Publishing, 1992
Buku Referensi