Encyclopedia of religious and spiritual development
edited by Elizabeth M. Dowling, W. George Scarlett
Sage Publications, 2006
 Buku Referensi
Development of spiritual assessment instrument (sheet)
 Artikel Jurnal
Mohd Zailani Mohd Yusoff
Influence of social norms and spiritual disposition to moral judgement in religious school students
UIN Ar-Raniry , 2017
 Artikel Jurnal
Geertz, Clifford
Islam observed : religious development in morocco and Indonesia
Yale University Press, 1968
 Buku Teks SO
Ward, Tara
Discover your psychic power: apractical guide to psychic development & spiritual growth
Arcturus, 1998
 Buku Teks