| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Chinese Mystics | 978-0-06-068832-5 (0-06-068832-7) | 1973 |
| Purgatory's Gate | 978-0-515-14267-9 (0-515-14267-0) | 2007 |
| Total Meditation: Mind Control Techniques for a Small Planet in Space | 978-0-02-067900-4 (0-02-067900-9) | 1978 |