Sipahutar, Nixon Dermawan Hasahatan, author
Universitas Indonesia, 1993
UI - Skripsi (Membership)
Sidabutar, Manginar, author
Universitas Indonesia, 1993
UI - Skripsi (Membership)
Gemala Dewi, author
Kencana, 2004
Buku Teks
Gemala Dewi, author
Kencana, 2004
Buku Teks
Gemala Dewi, author
Kencana, 2006
Buku Teks