APA
"United Nations E. C. f. E., "United Nations E. C. f. E., . (2004). Youth of the xxi century. New: York UN.
Chicago
"United Nations Economic Commission for Europe", "United Nations Economic Commission for Europe", . 2004. Youth of the xxi century. New: York UN.
Harvard
"United Nations E. C. f. E., "United Nations E. C. f. E., . (2004). Youth of the xxi century. New: York UN.
MLA
"United Nations Economic Commission for Europe", "United Nations Economic Commission for Europe", . Youth of the xxi century. New: York UN. 2004.