Artikel Jurnal
Sonquist, John A., author
Prentice-Hall, 1977
Buku Teks
Aditya Ardhana, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2008
UI - Tesis (Open)
Ahmad Sehu, author
Universitas Indonesia, 2003
UI - Tesis (Membership)
Albig, WIlliam
McGraw-Hill, 1939
Buku Teks