(2005). enviromental standards and competitiveness of key economic sectors. united nations.
Cytowanie według stylu Chicago (wyd. 17)Enviromental Standards and Competitiveness of Key Economic Sectors. new york: united nations, 2005.
Cytowanie według stylu MLA (wyd. 9)Enviromental Standards and Competitiveness of Key Economic Sectors. united nations, 2005.