Helen Burnham, A guide to Ancient and Historic Wales – Clwyd and Powys (London 1995)
Kenneth Cameron, English Place Names (London 1996)
Elwyn Davies, A Gazetteer of Welsh Place-Names (Cardiff 1957)
Dewi Davies, Welsh Placenames of Breconshire (Brecon 1971)
Howard C. Jones, Place Names In Glamorgan (Risca)
Bedwyr Lewis Jones, Yn Ei Elfen (Carreg Gwalch)
J. Lloyd-Jones, Enwau Lleoedd Sir Gaernarfon (Cardiff 1928)
Anthony Lias, Place-Names of the Welsh Borderlands (Ludlow 1991)
W.B. Lockwood, Languages of the British Isles Past and Present (London 1975)
Frances Lynch, A guide to Ancient and Historic Wales – Gwynedd (London 1995)
Richard Morgan & R.F. Peter Powell, A Study of Breconshire Place-Names (Carreg Gwalch 1999)
R. Morton Nance, A Guide to Cornish Place-Names (Penzance)
W.F.H. Nicolaisen, Scottish Place-Names (Edinburgh 2001)
Meirion Parry, Enwau Blodau, Llysiau a Choed (Caerdydd 1971)
Tom Parry, Mynegai i Weithiau Ifor Williams (Caerdydd 1939)
P.H. Reaney, The Origin of English Place Names (London 1977)
Colin Renfrew, Archaeology & Language (London 1998)
Mellville Richards, Enwau Tir a Gwlad (Caernarfon 1998)
R.J. Thomas, Enwau Afonydd a Nentydd Cymru (Cardiff 1938)
W.J. Watson, The Celtic Place Names of Scotland (Edinburgh 1926, 2004 ed.)
Ifor Williams, Enwau Lleoedd (Liverpool 1945)
Ar Draws Gwlad 1 & 2
Place names on maps of Scotland and Wales (OS 1973)