National Library of Wales: Ann Griffiths - Includes brief biography and bibliography; image of manuscript of letter. - http://www.llgc.org.uk/index.php?id=anngriffithsnlwms694d
Cardiff University: AnnGriffiths - Includes translations of hymns and letters, e-texts [PDF format] of books and manuscripts related to her life and work. - http://www.anngriffiths.caerdydd.ac.uk/