edited by M.Th. Houtsma, T.W. Arnold, R. Basset and R. Hartmann
Koros Press, 2011
Buku Referensi
Mohd Khairul Zul Hasymi Fridaus
Fakultas Ilmu Keperawatan Universitas Indonesia, 2020
Artikel Jurnal
Fatimah Husein
1990
UI - Tesis (Membership)
edited Muhammad Ali Khalidi
Cambridge, 2005
Buku Teks
Khan, Hazrat Inayat
The Sufi International Headquarter's, 1956
Buku Teks