H. Luke · Helen L. · Helen M. Luke
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Old Age: Journey into Simplicity | 978-1-58420-079-6 (1-58420-079-0) | 2010 |
| The Inner Story | 978-0-8245-0443-4 (0-8245-0443-7) | 1982 |
| The Voice Within: Love and Virtue in the Age of the Spirit | 978-0-8245-0659-9 (0-8245-0659-6) | 1984 |