1
by Reid
Published 2013
2
by Haberman
Published 1994
3
by Hansen
Published 1996
4
by Baldock
Published 2004
5
by Shah-Kazemi
Published 2006
6
by Hawwa
Published 2001
7
by Schuon
Published 1990
8
9
10
11
Published 2014
12
by Sheldrake
Published 2018
13