africa barnsoldater biography boysoldiers children childsoldiers historia history inbördeskrigetisierraleone1991-2002 juvenile juvenileliterature juvenileparticipation kind largetypebooks militaryparticipation newyorktimesbestseller newyorktimesreviewed nyt:paperback_nonfiction=2010-10-30 personalnarratives readinglevel-grade10 readinglevel-grade11 readinglevel-grade12 sierraleone socialconditions soldat soldiers west