Steiner, Rudolf
The philosophy of spiritual activity: fundamentals of a modern view of the world
Rudolf Steiner, 1963
 Buku Teks SO
Hardjono K.
Dari khayalan ke kenyataan: (penjelasan dan ulasan tentang Subud)
[publisher not identified], [date of publication not identified]
 Buku Teks SO
Chittick, William C.
Jalan cinta sang sufi: ajaran-ajaran spiritual Jalaluddin
Qalam, 2000
 Buku Teks
Frederikus Fios
Homo ecologicus spiritual-etis telaah etika lingkungan atas konsep humanisme ekologis Henryk Skolimowski = Homo ecologicus spiritual ethical environmental ethics viewing of the ecological concept of Henryk Skolimowski
2016
 UI - Disertasi Membership
Haryono Sumohadiwidjojo
Menapaki Subud secara intelektual / Haryono Sumohadiwidjojo
PPK Subud Indonesia, 2002
 Buku Teks