Karolyi, George
The Paranormal Phenomena Research Foundation, 2009
Buku Teks
edited by J. Gordon Melton
Gale Group, 2001
Buku Referensi
Ravishankar, Sri Sri
2003
Buku Teks
Hidayat Yoedoprawiro
Balai Pustaka, 2000
Buku Teks
Kaniasari
1997
UI - Skripsi (Membership)