Unyielding
| Copyright Holder | Revelen Press |
| Series | Girl in the Box, Out of the Box |
| Format | Paperback |
| Language | English |
| Location | USA |
| Copyright | 2016 |
| Pages / Font | 370 pages |
| Series Number | 21 |
| ISBN | 9781539935551 |
| Barcode | 9 781539 935551 |
| Price | $12.99 U.S. |
| Price | £8.49 U.K. |
Added by Supernaut1970