Soebagijo I.N.
PWI Pusat, 1977
Buku Teks
Fred Fedler ... [and others]
Fort Worth Harcourt Brace College , 1997
Buku Teks
Nainggolan, Juleoria, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2009
UI - Tesis (Open)
Winston, Kwok Chee Chiu, author
pearson Prentice Hall, 2007
Buku Teks
by Brian S. Brooks [and others]
Martins Press, 1992
Buku Teks