Tài liệu tham khảo WikiPedia: Poverty_Point http://www.thenewsstar.com/article/20130717/NEWS01... http://www.thenewsstar.com/article/20140622/NEWS01... http://tps.cr.nps.gov/nhl/detail.cfm?ResourceId=26... http://www.nps.gov/popo/ http://www.archaeologychannel.org/content/video/po... http://www.laarchaeology.org/articles.html http://whc.unesco.org/en/list/1435 http://www.crt.state.la.us/archaeology/POVERPOI/Po... http://www.crt.state.la.us/parks/ipvertypt.aspx https://irma.nps.gov/Stats/DownloadFile/243
