scholarly article by William Britnell published in January 1989

scientific article published in January 1993

article

article by Edith Evans et al published 1991 in Britannia

book; published in 1995

book

article published in Morgannwg in 1977

article published in Morgannwg in 1976

article published in Morgannwg in 1977

article published in Morgannwg in 1974

article published in Morgannwg in 1979

article published in Morgannwg in 1975

article published in Morgannwg in 1974

article by P. J. Casey et al published 1995 in Britannia

article published in Morgannwg in 1975

article published in Morgannwg in 1976

article published in Morgannwg in 1977

article published in Morgannwg in 1977

article published in Morgannwg in 1975

article published in Morgannwg in 1979

article published in Morgannwg in 1974