Universitas Indonesia, 1993
UI - Skripsi (Membership)
Universitas Indonesia, 2000
UI - Skripsi (Membership)
Harahap, Darwin, author
1997
UI - Tesis (Membership)
Universitas Indonesia, 1993
UI - Skripsi (Membership)
Universitas Indonesia, 1992
UI - Skripsi (Membership)