Artikel Jurnal
Sirait, Olivia Rachel, author
Universitas Indonesia, 2016
UI - Skripsi (Membership)
Sidiarto Kusumoputro, author
UI-Press, 2006
Buku Teks
nud Hansen....(et all)
Katalis Publishing, 2001
Buku Teks
Universitas Indonesia, 1997
UI - Skripsi (Membership)