1. The selection of essential drugs: report of a WHO expert committee;World Health Organisation,1977
2. The selection of essential drugs: second report of the WHO expert committee;World Health Organisation,1979
3. The use of essential drugs: first report of the WHO expert committee;World Health Organisation,1983
4. The use of essential drugs: second report of the WHO expert committee;World Health Organisation,1985
5. The use of essential drugs: third report of the WHO expert committee;World Health Organisation,1988