| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| To tame a savage heart: The first Wycliffe missionary translators to the Secoya and Orejon Indian tribes of the Amazon jungle in Peru, South America | 978-1-894169-63-9 (1-894169-63-8) | 1999 |
H.S. · R. H. · R. S. · Robert H. · Robert S. · Robert Sandberg