Han, Suzanne Crowder
Seoul : Hollym, 2007
Buku Teks
Seoul The Royal Asiatic Society 1998
Buku Teks
Seoul : Northeast Asian Foundation
Majalah, Jurnal, Buletin
Singh, Maharaj Charan
Yayasan Radha Soami Satsang Beas Indonesia , 2000
Buku Teks
Buku Teks