George, Carl J.
McGraw-Hill, 1974
Buku Teks
Nainggolan, Juleoria, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2009
UI - Tesis (Open)
editor, James P. Casey
John Wiley & Sons, 1980
Buku Teks
Published by Gramedia Pustaka Utama in cooperation with SPES Foundation, 1994
Buku Teks
Graham, Peter, author
Blackwell Scientific Publications, 2003
Buku Teks