| title | media type | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|---|
| The Integrity of the Servant Leader | Hardcover | 978-1-138-21292-3 (1-138-21292-X) | 2016 | Robert Sumi · Dana Mesner-Andolšek |
| The Integrity of the Servant Leader | Digital | 978-1-315-44961-6 (1-315-44961-7) | 2016 | Robert Sumi |
| The Integrity of the Servant Leader | " | 978-1-315-44963-0 (1-315-44963-3) | 2016 | " |