Gravity map of Sri Lanka - 1:1 000 000 (1982) Geological Survey Department Professional Paper No 3; Hatherton, T.; Sri Lanka, Ministry of Industries and Scientific Affairs
Householders guide to selecting a pit latrine (1981) Cotton, Andrew; Training Programmes in Water Supply and Sanitation for Sri Lanka 1981-1985; Water, Engineering and Development Centre (WEDC); Sri Lanka, National Housing Development Authority