 
| Type | Valeur | 
|---|---|
| Titre | Petronilla de Grandmesnil, "Find A Grave Index" | 
| "Find A Grave Index," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QVLX-WV1Q : 7 July 2020), Petronilla de Grandmesnil, 1212; Burial, , ; citing record ID , Find a Grave, http://www.findagrave.com. |