The British Heroic Age: the Welsh and the Men of the North, 1976. ,
Hymn to the Virgin, 1953. ,
The Celtic Roots of English dans la série Studies in Languages, 2002. ,
A Dictionary of Old Breton The History of the Norman Conquest of England, Its Causes and Failures, 1867. ,
Limited Interethnic Marriage, Differential Reproductive Success and the Spread of 'Continental' Y Chromosomes in Early Anglo- Saxon England, Simulations, Genetics and Human Prehistory, pp.1-25, 2008. ,
L'analyse phonétique de trois poèmes anglogallois du 15 e siècle : l'orthographe galloise comme indice pour la prononciation de l'anglais moderne primitif, le système vocalique, Bulletin des Anglicistes Médiévistes, vol.57, pp.1-21, 2000. ,
L'analyse phonétique de trois poèmes anglogallois du 15 e siècle : l'orthographe galloise comme indice pour la prononciation de l'anglais moderne primitif, le système consonantique, Bulletin des Anglicistes Médiévistes, vol.58, pp.65-81, 2000. ,
Britons, Anglo-Saxons and Scholars: 19 th century Attitudes towards the Survival of Britons in Anglo-Saxon England, Celtic-Englishes II, pp.347-374, 2000. ,
kings and Warriors: Population and Landscape from Post-Roman to Norman Britain The Peopling of Britain: The Shaping of a Human Landscape, The Linacre Lectures, pp.145-175, 1999. ,
Population Replacement or Acculturation? An Archaeological Perspective on Population and Migration in Post-Roman Britain, Celtic-Englishes III, pp.13-28, 2003. ,
Language and History in Early Britain: A Chronological Survey of the Brittonic Languages ? 1 st ? 10 th Centuries, 1953. ,
The Welshmen of English Literature, pp.224-260, 1882. ,
A Survey of Anglo-Welsh Dialects: The Southeast, 1977. ,
A Survey of Anglo-Welsh Dialects: The Southwest, 1979. ,
On Producing a Linguistic Atlas: The Survey of Anglo- Welsh dialects, Studies in Linguistics Geography, pp.55-66, 1985. ,
A Grammar and Glossary of the Conservative Anglo- Welsh Dialects of Rural Wales, Sheffield: The National Centre for English Cultural Tradition, 1999. ,
The English Element in Welsh: A Study of the English Loan, 1923. ,
English-Welsh Loanwords, Angles and Britons, O'Donnell Lectures, pp.43-59, 1963. ,
Welsh English: A National Language?, Dialectologia et Geolinguistica, vol.1993, issue.1, pp.28-46, 1985. ,
DOI : 10.1515/dig.1993.1993.1.28
The Anglo-Welsh Dialects of North Wales, Frankfort-am-Main, 1991. ,
The Constitutional History of England, 1870. ,
Adam's Curse, 2003. ,
Welsh English Language in the British Isles, pp.178-194, 1984. ,
Welsh English, Focus on England and Wales, pp.213-222, 1985. ,
DOI : 10.1075/veaw.g4.11tho
English in Wales The Cambridge History of the English Language, pp.94-147, 1994. ,
Attrition of Inflections in English and in Welsh The Celtic Roots of English (in the series Studies in Languages), pp.111-149, 2002. ,
Why Don't the English Speak Welsh?, Britons in Anglo-Saxon England, 2008. ,
DOI : 10.1017/UPO9781846155185.016
A History of Modern Colloquial English, 3 rd Edition, 1956. ,