‘Americans’: The Book That Changed Photography
http://www.npr.org/2009/02/13/100688154/americans-the-book-that-changed-photography
http://classes.dma.ucla.edu/Summer12/160-1/files/A1-RobertFrank-Slideshow.pdf
http://classes.dma.ucla.edu/Summer12/160-1/files/A1-RobertFrank-Reading.pdf
https://oscarenfotos.files.wordpress.com/2012/05/robert_frank_-_the_americans.pdf
http://www.steidlville.com/pictures/pdf/Steidl_Frank_Catalogue_A4.pdf