1. Geological Society Engineering Group Working Party report on the logging of rock cores for engineering purposes
2. Atkinson, J.H. , Pettifer, G.S., Fookes, P.G., Mechanical destructuring and disaggregation of Mercia mudstone. Proc. Conf. on The Engineering Properties of the Mercia Mudstone Group. Conference Record 2000/1 2000. 5–12 CIRIA.
3. BS 1377 British Standard Methods of Test for Soils for Civil Engineering Purposes. Part 2 Classification Tests 1990. British Standards Institution.
4. BS 5930 Code of Practice for Site Investigations., 1981. British Standards Institution.
5. Chandler, R.J. , Davis, A.G., Further Work on the Engineering Properties of Keuper Marl. Report No.47 1973. CIRIA.