Universitas Indonesia, 1996
UI - Skripsi (Membership)
Tampubolon, Parlinggoman, author
2007
UI - Tesis (Membership)
Parlinggoman, Tampubolon
2007
UI - Tesis (Membership)
Universitas Indonesia, 2010
UI - Skripsi (Membership)
Universitas Indonesia, 2005
UI - Skripsi (Membership)