1. Anon 1986. NZS 4402:1986 Methods of Testing Soils for Civil Engineering Purposes. 2.8.3/1-9 Standards Association of New Zealand.
2. Beattie, A. G. 1990. Petrological Controls on the Geomechanical Behaviour of Coal Measure Soft Rocks, Waikato, New Zealand. MSc thesis, University of Waikato.
3. Bell, D. H. & Pettinga, J. R. 1984. Presentation of geological data. Proceedings of the Symposium on Engineering for Dams and Canals, Alexandra. 9/49, 4.1-4.33.
4. Bell, D. H. & Pettinga, J. R. 1988. Bedding-controlled landslides in New Zealand soft rock terrain. Proceedings of the 5th Interna- tional Symposium on Landslides, 10-15 July 1988, Lausanne, 77-83.
5. Brown, E. T. (ed.) 1981. Rock Characterization, Testing and Monitoring. ISRM Suggested Methods. Published for the Commission on Testing Methods, International Society for Rock Mechanics by Pergamon, Oxford.