Crook and Billy Row urbanised medieval village (Crook) - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Roberts, B K, Austin, D | Aug-1975 | A Preliminary Check List of Rural Clusters in County Durham AKA Checklist | |
| 2 | Nairn, I | 1964 | Nairn's County Durham A townscape Gazeteer County Durham | |
| 3 | Turnball, P, Jones, R | 1978 | The archaeology of the coal measures and the magnesian limestone escarpment in Co. Durham | Crook and Willington, Archaeology, page 49, no.18 |