World Health Organization. Technical Publications Unit Geneva 2012-06-16T13:44:20Z 2012-06-16T13:44:20Z 1993 1993-12-31 WHO/PUB/TPS/93.1 116 p. WHO/PUB/TPS/93.1 8872660203 (ita) https://iris.who.int/handle/10665/36842 English Italiano en it World Health Organization World Health Organization Writing Publishing Information Systems and Communication WHO editorial style manual Updated and reprinted 1994, 1998