Self-Discipline: Unbreakable Grit: How to Develop Jaw-Dropping Grit, Unrelenting Willpower, and Incredible Mental Toughness
| Country | USA |
| Brand | National Geographic |
| Manufacturer | National Geographic Maps |
| Binding | Paperback |
| ItemPartNumber | 9781566957069 |
| UnitCount | 1 |
| EANs | 9781566957069 |
| ReleaseDate | 0000-00-00 |