1. Structures do not settle in this shale, but watch out for heave.;Engineering News Record,,1960
2. Attewell, P. B. & Taylor, R. K. 1973. Clay shale and discontinuous rock mass studies. Final Report to European Research Office, U.S. Army, Contract No. DA-ERO-591-72-G0005.
3. The disintegration of shales in water.;Journal of the Institute of Fuel,,1956
4. Banks, D. C, Strohm, W. E., de Angulo, M. & Lutton, R. J. 1975. Study of clay shale slopes and the Panama Canal. Report 3. Engineering analyses of slides and strength properties of clay shales along the Gaillard Cut. Technical Report 5–70–9. US Army Engineers Waterways Experiment Station, Vicksburg, Miss.
5. Beckett, P. J., Cummings, A. D. & Whitmore, R. L. 1958. Interfacial properties of Coal-Measure shales in water. Proceedings of Conference on Science in the Use of Coal, Sheffield University, Paper 12, 14–19.