James, W. H., 'The Search for Lady Constantia', book, 2002 - details of extant records on Archives Network Wales
"William Henry James, teacher ......... He undertook research into the James and Bates families of Rhoscolyn,Holyhead and Llanynghenedl, in western Anglesey; his account of them was published privately in 2002 as The Search for Lady Constantiaand in Welsh as Ar drywydd y Fonesig Constantia.
Rev. Huw Llewelyn Williams Papers 1836-1974 - details of extant records on Archives Network Wales
"The Rev. Huw Llewelyn Williams (1904-1979), Holyhead, Anglesey, was the Calvinistic Methodist minister of Valley and Rhoscolyn ......."