Infinity Ring Book 7: The Iron Empire - Audio
| Country | USA |
| Author | Matt de la Peña |
| Binding | Audio CD |
| Brand | Pena, Matt De La/ Graham, Dion (NRT) |
| EAN | 9780545675291 |
| Edition | Unabridged |
| ISBN | 0545675294 |
| Label | Scholastic Audio Books |
| Manufacturer | Scholastic Audio Books |
| NumberOfItems | 1 |
| PublicationDate | 2014-08-26 |
| Publisher | Scholastic Audio Books |
| ReleaseDate | 2014-07-29 |
| Studio | Scholastic Audio Books |