Nasution, Rika Sahara
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2012
UI - Tesis Membership
The World Bank, 1996
Buku Teks
Milan, Deanne K.
Random House, 1988
Buku Teks
Ory, John C.
Sage, 1993
Buku Teks
Spears, Deanne Milan
McGraw-Hill, 2000
Buku Teks