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WikiPedia: Tuổi_trẻ http://www.macmillandictionary.com/dictionary/amer... http://www.merriam-webster.com/dictionary/youth http://dictionary.reference.com/browse/youth http://www.yourdictionary.com/youth http://cjjr.georgetown.edu/pdfs/TransitionPaperFin... http://eric.ed.gov/?id=EJ087128 http://id.loc.gov/authorities/subjects/sh85149310 http://d-nb.info/gnd/4028859-6 http://id.ndl.go.jp/auth/ndlna/00570355 http://www.icap.org/portals/0/download/all_pdfs/ic...