Tampubolon, Robinhood, author
Universitas Indonesia, 1991
UI - Skripsi (Membership)
Sumitro, author
1987
UI - Skripsi (Membership)
Universitas Indonesia, 1992
UI - Skripsi (Membership)
George Carqua, author
1986
UI - Skripsi (Membership)
Universitas Indonesia, 1992
UI - Skripsi (Membership)