 
| Type | Valeur | 
|---|---|
| Titre | Legacy NFS Source: William FitzWilliam - | 
| Personnes | 
|---|
|  Sir WILLIAM FitzWilliam I Sprotborough | 
| The Second Crusade: Extending the Frontiers of Christendom, Jonathan Phillips, Name: Yale University Press; Date: 2007;, Page number: p. 311, n. 15 | 
| Jonathan Phillips, The Second Crusade: Extending the Frontiers ofChristendom (Yale University Press, 2007). |