| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Drupal 8 Module Development | 978-1-78216-877-5 (1-78216-877-X) | 2016 |
| Drupal Rules How-To | 978-1-84951-998-4 (1-84951-998-6) | 2012 |
Robert V. · Robert Vehrkamp · Robert Vergnieux · Roberto Veracini · Roberto Verganti