Davies, D. (1924). The ancient Celtic Church and the See of Rome: A refutation to the assertions of Dr. Mostyn, the Roman Catholic Archbishop of Cardiff, namely, "... that from the earliest period the Celtic Church not only believed in the Mass, the Sacraments, and the other doctrines of the Catholic Church, but was also in communion with the See of Rome". W. Lewis.

Davies, David. The Ancient Celtic Church and the See of Rome: A Refutation to the Assertions of Dr. Mostyn, the Roman Catholic Archbishop of Cardiff, Namely, "... That from the Earliest Period the Celtic Church Not Only Believed in the Mass, the Sacraments, and the Other Doctrines of the Catholic Church, but Was Also in Communion with the See of Rome". W. Lewis, 1924.