Bibliography
http://xroads.virginia.edu/~ma01/davis/photography/riis/riis.html
http://www.spartacus.schoolnet.co.uk/
http://www.latinamericanstudies.org/nast.htm
http://www.historybuff.com/library/refnast.html
http://www.npr.org/templates/story/story.php?storyId=91981589
http://lenbernstein.com/RiisArticle.html
http://xroads.virginia.edu/~ma01/davis/photography/riis/riis.html
http://www.spartacus.schoolnet.co.uk/
http://www.latinamericanstudies.org/nast.htm
http://www.historybuff.com/library/refnast.html
http://www.npr.org/templates/story/story.php?storyId=91981589
http://lenbernstein.com/RiisArticle.html