Universitas Indonesia, 1992
UI - Skripsi (Membership)
Universitas Indonesia, 1996
UI - Skripsi (Membership)
Purba, Riando Hastain, author
Universitas Indonesia, 1995
UI - Skripsi (Membership)
Universitas Indonesia, 2002
UI - Skripsi (Membership)
Universitas Indonesia, 2006
UI - Skripsi (Membership)