1 Black-Michaud, J.; Malalgoda, M.; Schipper, R. A.; Thio, K. S.. 1982. Reduced planning efforts: identification of rural potentials in selected key regions of Ratnapura. ARTI/Wageningen University Research Project in Agricultural Planning. Report 6 in Regional Planning for Agricultural Development in Sri Lanka. Colombo, Sri Lanka: Agrarian Research and Training Institute (ARTI). 99p. (ARTI Research Study 53)
2 Polman, F. J.; Samad, M.; Thio, K. S.. 1982. A demonstration of resource based socio-economic planning in Matara district. ARTI-Wageningen University Research Project in Agricultural Planning. Report 1 in Regional Planning for Agricultural Development in Sri Lanka. Colombo, Sri Lanka: Agrarian Research and Training Institute (ARTI). 247p. (ARTI Research study 47)