1. ANON. (1972): The preparation of maps and plans in terms of engineering geology. Q. Jl. Engng Geol. 5, 293–381.
2. BRIDGE D.Mc. (1976): Geological report, sheet NB 46-12-C (Banda Aceh). Integrated Geological Survey of Northern Sumatra. Report No. 17 (unpublished).
3. CRATCHLEY C.R.—CONWAY B.W.—NORTHMORE K.J.—DENNESS B. (1979): South Essex geological and geotechnical survey. IAEG symposium on engineering geological mapping, Newcastle upon Tyne, September 1979.
4. CULSHAW M.G.—DUNCAN S.V. (1977): Coding manual and dictionary for an engineering geological data system. Unpublished report for the Engineering Geology Section of the Geological Survey of Indonesia.
5. CULSHAW M.G.—DUNCAN S.V. (1978): Coding manual and dictionary for an engineering geological data system: part 2, interpretation records. Unpublished report for the Engineering Geology Section of the Geological Survey of Indonesia.