Universitas Indonesia, 1991
UI - Skripsi (Membership)
Universitas Indonesia, 1991
UI - Skripsi (Membership)
Silalahi, Robert Nelson, author
Universitas Indonesia, 2005
UI - Tesis (Membership)
Universitas Indonesia, 2001
UI - Tesis (Membership)
Ma`mun Sumarna, author
Universitas Indonesia, 2000
UI - Skripsi (Membership)