Literature around the 'Westminster model ' (inter alia Lijphart 1999, Rhodes et al 2009) and Welsh devolution model (Wyn Jones and Scully 2012)
Llenyddiaeth ynghylch 'model San Steffan' (inter alia Lijphart 1999, Rhodes et al 2009) a model datganoli Cymru (Wyn Jones and Scully 2012)