Situmorang, Marihat, author
1999
UI - Tesis (Membership)
Universitas Indonesia, 1997
UI - Skripsi (Membership)
Siallagan, Pitua, author
Universitas Indonesia, 2003
UI - Skripsi (Open)
Salemba Infotek, 2004
Buku Referensi
Rambe, Ropaun, author
Sinar Grafika, 2003
Buku Teks