BRYCHEINIOG / BRECONSHIRE
Fychan, Angharad: Astudiaeth o Enwau Lleoedd Gogledd Cantref Buellt. Traethawd Ph.D. Prifysgol Cymru, 2001. http://cadair.aber.ac.uk/dspace/handle/2160/5925
Morgan, Richard & Evans, G. G.: Enwau Lleoedd Buallt a Maesyfed, 1993.
Morgan, Richard & Powell, R. F. Peter: A Study of Breconshire Place-names, 1999.
Powell, R. F. Peter: The Place-Names of Devynock Hundred, 1993.
CAERFYRDDIN / CARMARTHENSHIRE
Cronfa Ddata Enwau Lleoedd Cymdeithas Hynafiaethwyr Sir Gaerfyrddin
Grŵp Hanes Blaenau Tywi: Enwau yn y Tirwedd: Blaenau Tywi: Names in the Landscape, 2014.
CAERNARFON / CAERNARFONSHIRE
Carr, Glenda: Hen Enwau o Arfon, Llŷn ac Eifionydd, 2011.
Gruffydd, Elfed: Ar hyd Ben ‘Rallt: Enwau Glannau Môr Penrhyn Llŷn, 1999.
Jones, Iwan Arfon: Enwau Eryri: Place-names in Snowdonia, 1998.
Lloyd-Jones, John: Enwau Lleoedd Sir Gaernarfon, 1928.
CEREDIGION / CARDIGANSHIRE
Wmffre, Iwan: Language and Place-names in Wales: the Evidence of Toponymy in Cardiganshire, 2003.
Wmffre, Iwan: The Place-names of Cardiganshire vol. i-iii., 2004.
DINBYCH / DENBIGHSHIRE
Pratt, Derrick: ‘The Marcher Lordship of Chirk, 1329–1330′, in Transactions of the Denbighshire Historical Society xxxix. (1990) 5–41.
Pratt, Derrick: ‘The Medieval Borough of Chirk’, in Transactions of the Denbighshire Historical Society xlvi. (1997) 26–51.
Pratt, Derrick: ‘Fourteenth-century Wrexham’, in Transactions of the Denbighshire Historical Society lv. (2007) 19–65.
Pratt, Derrick: ‘Valle Crucis Abbey: Lands and Charters’, in Transactions of the Denbighshire Historical Society lix. (2011) 9–55.
FFLINT / FLINTSHIRE
Davies, Ellis: Flintshire Place-names, 1959.
Owen, Hywel Wyn: Enwau Lleoedd Bro Dyfrdwy ac Alun, 1991.
Owen, Hywel Wyn: Place-Names of Dee and Alun, 1995.
Owen, Hywel Wyn: The Place-Names of East Flintshire, 1994.
Owen, Hywel Wyn & Gruffydd, Ken Lloyd: Place-Names of Flintshire, 2017.
KLGF = Cronfa Ddata / Database compiled by Ken Lloyd Gruffydd
MAESYFED / RADNORSHIRE
Dafydd, Iolo: Enwau Lleoedd Cwmteuddwr. Traethawd M.A. Prifysgol Cymru, 1980.
Morgan, Richard: A Study of Radnorshire Place-names, 1998.
Morgan, Richard & Evans, G. G.: Enwau Lleoedd Buallt a Maesyfed, 1993.
MALDWYN / MONTGOMERYSHIRE
Montgomery Placename Database http://archaeologydataservice.ac.uk/archives/view/montpn_na_2004/
Morgan, Richard: A Study of Montgomeryshire Place-names, 2001.
Morgan, Richard: Enwau Lleoedd ym Maldwyn, 2003.
MEIRIONNYDD / MERIONETH
Adnabod Ardudwy / Knowing Ardudwy
Williams, T. H.: The Study of the Place-names of Merioneth. University of Wales M.A. Thesis, 1931.
MÔN / ANGLESEY
Carr, Glenda: Hen Enwau o Ynys Môn, 2015.
Jones, Gwilym T.: Afonydd Môn / The Rivers of Anglesey, 1989.
Jones, Gwilym T.: Rhydau Môn / The Fords of Anglesey, 1992.
Jones, Gwilym T. & Roberts, Tomos: Enwau Lleoedd Môn, 1996.
MORGANNWG / GLAMORGAN
Harries, B. D.: Enwau Lleoedd Hen Arglwyddiaeth Tal y Fan. Traethawd M.A. Prifysgol Cymru, 1956.
John, Deric: Cynon Valley Place-names, 1998.
John, Deric: Notes on Some Place-Names in and around the Bont, 1999.
Jones, Howard C.: Place Names in Glamorgan, 1976.
Pierce, Gwynedd O.: Place-names in Glamorgan, 2002.
Pierce, Gwynedd O.: ‘The evidence of place-names’ in Hubert N. Savory (gol.) Glamorgan County History ii. (1984) 456–92.
Pierce, Gwynedd O.: The Place-names of Dinas Powys Hundred, 1968.
Thomas, R. J.: Astudiaeth o Enwau Lleoedd Cwmwd Meisgyn gyda Sylw Arbennig i Blwyf Llantrisant. Traethawd M.A. Prifysgol Cymru, 1933.
MYNWY / MONMOUTHSHIRE
Morgan, Richard: Place-names of Gwent, 2005.
PENFRO / PEMBROKESHIRE
Charles, B. G.: The Place-names of Pembrokeshire vol. i-ii., 1992.
Wade-Evans, A. W.: ‘Pembrokeshire notes’ in Archaeologia Cambrensis xc. (1935) 123–34.
TU ALLAN I GYMRU / OUTSIDE WALES
Laporte, Nadine I.: Welsh Place-names in Patagonia. University of Wales M.A. Thesis, 1993.