Stone, P; Millward, D; Young, B; Merritt, J W; Clarke, S M; McCormac, M; Lawrence, D J D. British regional geology: Northern England. British Geological Survey. 2010. (原始内容存档于18 March 2017).
Stone, P; Millward, D; Young, B; Merritt, J W; Clarke, S M; McCormac, M; Lawrence, D J D. British regional geology: Northern England. British Geological Survey. 2010. (原始内容存档于18 March 2017).