An excellent resource from Villanova University:

Library Exhibits :: To Strike for Freedom! The 1916 Easter Rising

This booklist is worth checking out, too (six pages of listings) (the link is too long to make clickable):

http://www.dublincity.ie/sites/default/files/content/RecreationandCulture/libraries/Heritage%20and%20History/Documents/1916-booklists.pdf