prepared by A. Trant.Commission of the European Communities, Directorate-General ‘Scientific and Technical Information and Information Management’1978.<A163-B2038>
prepared by Faye Benedict, editor, on behalf of the Norwegian National Commission for UNESCO in co-operarion with UNESCO-UNEP International Envaironmental Education Programme(IEEP) and UNESCO Associated Schools Project(ASP)Norwegian University Pressc1991