R.J.O. Hamblin, B.S.P. Moorlock, J.R. Lee, J.B. Riding and S.J. Booth (2005) “Revised Pre-Devensian glacial stratigraphy in Norfolk, England, based on mapping and till provenance”, Netherlands Journal of Geosciences, 84, pp. 77 - 85. doi: 10.1017/S0016774600022976.