Artikel Jurnal
Naibaho, James M. P., author
2005
UI - Tesis (Membership)
Anton Tabah, author
Kharisma, 1999
Buku Teks
Purwanto Widodo, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2003
UI - Tesis (Membership)
Smith, John B., author
UI-Press, 1988
Buku Teks