Simanjuntak, Johannes Roberto Hasibuan, author
Universitas Indonesia, 2010
UI - Skripsi (Open)
Adami Chazawi, author
Sinar Grafika, 2011
Buku Teks
Citra Umbara, 2009
Buku Teks
Ketaren, Linda C., author
Universitas Indonesia, 1999
UI - Skripsi (Membership)
Citra Umbara, 2012
Buku Teks