Melton, J. Gordon
The encyclopedic handbook of cults in America
Garland Publishing, 1986
 Buku Referensi
Contemporary religions: a world guide
edited by Ian Harris ... [and others]
Longman Current Affairs, 1992
 Buku Teks SO
Muhammad Qodari
Sifat keterbukaan-ketertutupan sistem kepercayaan peserta gerakan tarbiyah di kalangan mahasiswa universitas indonesia
Fakultas Psikologi Universitas Indonesia, 1997
 UI - Skripsi Membership
Lewis, I.M.
Religion in context : cults and charisma
Cambridge University Press, 1996
 Buku Teks SO
Numen : international review for the history of religions = (International) Association for the history of religions
Leiden : E.J. Brill
 Majalah, Jurnal, Buletin