The Celtic Inscriptions of Britain: Phonology and Chronology, c. 400-1200

"[Sims-Williams's] concern is to give due weight to all the possibilities rather than to rush into one attractive interpretation. This will make the book extremely valuable as a restraining influence on the rasher tendencies of other scholars. The Celtic Inscriptions of Britain is a major achievement in Celtic historical linguistics and will be an indispensible work of reference for many years to come."
Antiquity <!--end-->

"(Celtic Inscriptions of Britain) represents an invaluable contribution to its field."
Cumbrian Medieval Celtic Studies