1. The rational use of drugs. Report of the Conference of Experts, Nairobi, 25-29 November 1985. Geneva, World Health Organisation, 1987.
2. Walker GJ, Hogerzeil HV, Sallami AO, Alwan AA, Fernando G, Kassem FA. Evaluation of rational drug prescribing in Democratic Yemen. Soc Sci Med 1990;31:823-828.
3. Laing RO. Rational drug use: an unsolved problem. Trop Doct 1990;20:101-3.
4. Hogerzeil HV, Walker GJA, Sallami AO, Fernando F. Impact of an essential drugs programme on availability and rational use of drugs. Lancet 1989;(i): 141-2.
5. Christensen, RF. A strategy for the improvement of prescribing and drug use in rural facilities on Uganda. Uganda Essential Drugs Management Programme, 1990.
6. The use of essential drugs. Model list of essential drugs (seventh list). Geneva, World Health Organisation, 1990. Technical Report Series 825.
7. Lemeshow S, Stroh G. Sampling techniques for evaluating health parameters in developing countries. Washington D.C.: National Academy Press, 1988.
8. Lemeshow S, Stroh G. Quality assurance sampling for evaluating health parameters in developing countries. Survey Methodology 1989;15:71-81.
9. Lanata CF, Black RF. Lot quality assurance sampling techniques in health surveys in developing countries: advantages and current constraints. World Health Statistics Quarterly 1991;44(3):133-139.
10. Valadez JJ. Assessing child survival programs in developing countries. Testing lot quality assurance sampling. Harvard, Harvard University Press: Harvard Series on Population and International Health, 1991.
11. Lanata CF, Stroh G, Black RF, Gonzales H. An evaluation of lot quality assurance sampling to monitor and improve immunization coverage. Int J Epid 1990; 19(4): 1086-90.
12. Pierre-Louis JN. Oral rehydration program evaluation by quality assurance sampling in rural Haiti. Am J Pub Health 1991;81(9): 1205-7.
13. Odeh RE, Owen DB. Tables for normal tolerance limits, sampling plans, and screening. New York; Marcel Dekker: 1980.