↑ 3.03.13.23.33.43.53.63.7Wren, Wilfrid J. 1968. The Tanat Valley: Its Railways and Industrial Archaeology. tt148-158. David & Charles
↑Yn ôl Wren caewyd yr holl gloddfeydd yn ardal Dyffryn Tanad erbyn y 1880au. Ailagorwyd rhai pan agorwyd rheilffordd Dyffryn Tanad yn 1904 ond fe'u caewyd am byth ar ddechrau'r ail ryfel byd.
↑Holmes, A.T. 1986. Slates from Abergynolwyn: The Story of Bryneglwys Slate Quarry. t.12 Gwynedd Archives Service
↑ 6.06.16.26.36.46.56.6Hague, Douglas B. 1984. A Guide to the Industrial Archaeology of Mid-Wales. tt12-15 Association for Industrial Archaeology
↑Holmes, A.T. 1986. Slates from Abergynolwyn: The Story of Bryneglwys Slate Quarry. t.35 Gwynedd Archives Service
↑ 8.08.18.2John, Brian S. 1975. Old Industries of Pembrokeshire. t.4 Greencroft Books