|  Ferrers, Earls of Derby, in the History of the County of Derby, Part II, pg. 522-524 [See document in the Memories section] |  | Originale | Seconde main | Directe | 
		
			|  First of the family surnamed Ferrers in the Foundation for Medieval Genalogy ~http://fmg.ac/Projects/MedLands/ENGLISH%20NOBILITY%20MEDIEVAL1.htm#_Toc21106894 [See document in the Memories section] |  | Originale | Seconde main | Directe | 
		
			|  Geni - Sybil de Braose |  | Originale | Seconde main | Directe | 
		
			|  North America, Family Histories, 1500-2000 |  | Originale | Seconde main | Directe | 
		
			|  Our royal, titled, noble and commoner ancestors |  | Originale | Seconde main | Directe | 
		
			|  Sybil de Braose de Ferrers, "Find A Grave Index" |  | Originale | Seconde main | Directe | 
		
			|  Sybil de Braose de Ferrers, "Find A Grave Index" |  | Originale | Seconde main | Directe | 
		
			|  The Foundation for Medieval Genealogy ~Guillaume de Braose [See document in the Memories section] |  | Originale | Seconde main | Directe | 
		
			|  William de Ferrers, 3rd Earl of Derby, from Cokayne's Complete Peerage, Vol. 3, page 65 [See document in the Memories section] |  | Originale | Seconde main | Directe |