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2. Gcncvai: World Hacalth Orgainisaition;th rcvision,1977
3. Field nethods for ti/e control of trachoinc. Gcnevat: World Hcalth Orgainisation;Tarizzo, M.L.,1973
4. The incidcncc aind caiuscs of blindncss in England aind Wales. 1948-1962;Sorshy, A.;Rep Healtlh Soc, Subj (Lotu(l),1966
5. Section 5 and Annex II of the rcport of WHO Programme Advisory Groupon the Prcvcntion of blindncss, Gcncva (unpublished WHO documcnt PBL. 79.1) reproduccd in: Wilson. J. Worldt blicdtie.s.s at(i its preventionl,1981