Ewing, J.H.
The world's living religions : a searching comparison of the faiths of east and west
Dell Publishing, 1964
 Buku Teks SO
The concise encyclopedia of living faiths
Hutchinson, 1959
 Buku Referensi
Su, Heung-Ryeol
Jayeonjueui = 자연주의
Ihwayeojadehagyo Chulphan bu, 2006
 Buku Teks
Stevenson, Leslie Forster
Twelve theories of human nature
Oxford University Press, 2012
 Buku Teks SO
Eko P. Dharmawan.
Agama itu bukan candu : tesis-tesis Feuerbach, Marx dan Tan Malaka
Resist Book, 2005
 Buku Teks