| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1999 | 978-0-9676187-0-8 | Robert Jack Kravitz | The Janitorial Contractors Bible |
| '' | 978-0-9676187-1-5 | Robert Kravitz | La Biblia del contratista de servicios de limpieza |
| '' | 978-0-9676187-2-2 | Robert Jack Kravitz | Get That Account! |