"The Life and Teachings of the Masters of The Far East"
by Baird Spalding

"Spirit Teachings"
by William Stainton Moses

"Blue Island"
by W. T. Stead

"A Treatise On White Magic"
by Alice A. Bailey

"Isis Unveiled" - Vol. I
"Isis Unveiled" - Vol. II
by H. P. Blavatsky
 

"The Secret Teachings of All the Ages"
by Manley P. Hall

"A Dweller On Two Planets"
by Phylos

"The Masters and the Path"
"Clairvoyance"
"Invisible Helpers"
"The Life After Death"
"The Chakras"
"Thoughtforms"
"The Hidden Side of Things"
"Man, Visible and Invisible"
by C. W. Leadbeater