Naupal, author
Universitas Indonesia, 1999
UI - Tesis (Membership)
Watt, William Montgomery, author
Perhimpunan Pengembangan Pesantrean dan Masyarakat (P3M), 1987
Buku Teks
Yardan, John L., author
The Council for Research in Values and Philosophy , 2001
Buku Teks
Fauzan Muslim, author
Fakultas Ilmu Pengatahuan Budaya Universitas Indonesia, 1995
UI - Laporan Penelitian
Huber, Carlo, author
The Council for Research Values and Philosophy , 2001
Buku Teks