Rampa, T. Lobsang, author
Ballantine Books, 1973
Buku Teks
Orakas Suroso, author
Bahagia, 1990
Buku Teks
Fullerton, D.
London Cumberledge 1949
Buku Teks
Kubasek, Raimund, author
Bethania Verlag, 1976
Buku Teks
Lewis-Williams, David, author
Thames & Hudson, 2002
Buku Teks