http://www.e-gymraeg.org/cronfabaledi/
http://cat.llgc.org.uk/cgi-bin/gw/chameleon?skin=baledi
http://people.ds.cam.ac.uk/dwew2/hcwl/hafan.htm
http://www.caerdydd.ac.uk/insrv/libraries/scolar/digital/welshballads/index.html
