Artikel Jurnal
Jakob Oetama, 1931-, author
Buku Kompas, 2001
Buku Teks
Gunardi Endro, author
Universitas Indonesia, 1999
UI - Tesis (Membership)
Simorangkir, O.P., author
Rineka Cipta, 2003
Buku Teks
Muhammad Djakfar, author
UIN-Malang Press, 2009
Buku Teks