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Mitchell, S.F. and Underwood, Charlie J. (1999) Lithological and faunal stratigraphy of the Aptian and Albian (Lower Cretaceous) of the Type Speeton Clay, Speeton, N.E. England. Proceedings of the Yorkshire Geological Society 52 (3), pp. 277-296. ISSN 0044-0604.
Underwood, Charlie J. and Mitchell, S.F. and Veltkamp, K.J. (1999) Microborings in mid Cretaceous fish teeth. Proceedings of the Yorkshire Geological Society 52 , pp. 269-274. ISSN 0044-0604.