1. Modified Mahalanobis filters for grouping pottery by chemical composition;Beier;Archaeometry,1994
2. A newly identified Late Roman Tile Group from Southern England;Betts;Britannia,1994
3. Betts, I. M., 1985. A Scientific Investigation of the Brick and Tile Industry of York to the Mid-Eighteenth Century. University of Bradford PhD Thesis.
4. Excavation of the Roman fortress at Carpow, Perthshire;Birley;Proc. Soc. Ant. Scot.,1965
5. The Geology of England and Wales,2006