Universitas Indonesia, 2002
UI - Skripsi (Membership)
[Universitas Indonesia, ], 2007
UI - Skripsi (Membership)
Hutagalung, Cathrina H., author
Universitas Indonesia, 1993
UI - Skripsi (Membership)
Panjaitan, Hulman, author
Ind-Hill, 2003
Buku Teks
Panjaitan, Hulman, author
Ind-Hill, 2008
Buku Teks