Robert of Normandy
| Author(s) | Title | Reference | |
|---|---|---|---|
| Frank Barlow | The Ecclesiastical History of Orderic Vitalis vol. VI: Books xi, xii, and xiii (Oxford Medieval Texts), by Marjorie Chibnall | 48/1, p. 118 | |
| Austin L. Poole | The Literacy of the Medieval English Kings, by V. H. Galbraith | 5/3, p. 229 |