Gerard
| Author(s) | Title | Reference | |
|---|---|---|---|
| V.H. Galbraith | English Manuscripts in the Century after the Norman Conquest, by N. R. Ker | 30/2, p. 111 | |
| M.J. Wilks | Church, Kingships and Lay Investiture in England, 1089-1135, by Norman F. Cantor | 30/2, p. 134 |