Ancestry.com. The pedigree of William Griffith, John Griffith and Griffith Griffiths [database on-line]. Provo, UT: Ancestry.com Operations Inc, 2005.Original data: Glenn, Thomas Allen,. The pedigree of William Griffith, John Griffith and Griffith Griffiths : (sons of Griffith John, of the parish of Llanddewi Brefi, in the county of Cardigan, South Wales, Great Britain), who removed to the county of Chester, Pennsylvania, in the early part of the XVIII century. Philadelphia: One hundred copies privately printed, 1905.