Stephanie, author
Universitas Indonesia, 2008
UI - Skripsi (Open)
Sitompul, S.M., author
Gadjah Mada University Press , 1995
Buku Teks
Triharso, author
Gadjah Mada University Press, 1994
Buku Teks
Nonon Saribanon Rubyawan, author
1996
UI - Tesis (Membership)
Artikel Jurnal