The Notebooks of Paul Brunton (Published in 1989; 16 volumes) - Volume 11: THE SENSITIVES - ch.12. THE INTERMEDIATE ZONE - online text at "Notebooks of Paul Brunton". Archived from the original on 2008-03-17. Retrieved 2008-04-25.
The Notebooks of Paul Brunton (Published in 1989; 16 volumes) - Volume 11: THE SENSITIVES - ch.12. THE INTERMEDIATE ZONE - online text at "Notebooks of Paul Brunton". Archived from the original on 2008-03-17. Retrieved 2008-04-25.