J. E. · J.V. · J. Van · Jaap, PhD Van Etten
Frontier Publishing · Light Technology Publishing
| title | ISBN-13 | year of publication |
|---|---|---|
| Crystal Skulls: Expand Your Consciousness | 978-1-62233-000-3 | 2013 |
| Crystal Skulls: Interacting with a Phenomenon | 978-1-891824-64-7 | 2007 |
| Gifts of Mother Earth: Earth Energies, Vortexes, Lines, and Grids | 978-1-891824-86-9 | 2011 |
| Het fenomeen kristallen schedels | 978-90-78070-60-3 | 2014 |