Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Nitschke, Christoph and Schumann, U. and Skoppek, Michael and European Centre for the Development of Vocational Training",Occupational and qualification structures in the field of environmental protection in the metal and chemical industries : study on the Federal Republic of Germany,1st ed,"CEDEFOP, European Centre for the Development of Vocational Training",1991,CEDEFOP document,,9282620158,,https://cir.nii.ac.jp/crid/1130000796336996096