Universitas Indonesia, 1998
UI - Skripsi (Membership)
Pulung Karo Karo, author
1998
UI - Tesis (Membership)
Sinaga, Fiter Ubrin, author
Universitas Indonesia, 1996
UI - Skripsi (Membership)
Universitas Indonesia, 2001
UI - Skripsi (Membership)
Universitas Indonesia, 2002
UI - Skripsi (Membership)