Vikings
| Author(s) | Title | Reference | |
|---|---|---|---|
| R.I. Page | Denmark in World History, by Viggo Starcke | 34/1, p. 81 | |
| R.I. Page | A History of the Vikings, by Gwyn Jones | 41/1, p. 89 | |
| David M. Wilson | The Viking Century in East Yorkshire, by A. L. Binns | 33/2, p. 161 |