Borsley R.D. , Morris Jones B. Welsh Negation and Grammatical
Theory. - University of Wales Press, 2005. - 352 p.
Offering insight into a neglected area of Welsh studies, this book
focuses on the ways negation works in colloquial Welsh and briefly
touches upon the literary Welsh language, illustrating the numerous
ways a negative sentence is formed and explaining the conventions
that native speakers must follow when using negative pattes.