There are some great textual sources here. Particularly the Encyclopedia of Race and Racism in America. These will count as a Book source (these are after all books that just happen to be found on a url). When you cite these cite them in Noodletools like a database (GALE GVRL) and then select book.
Primary sources galore! Many of these are full of images that can be scanned on the library copier.
The following sites will help in your search for images from the Reconstruction era. Remember that you have to cite any images that you find. Basic image citation follows this format:
Last Name, First Name. Title. Date Taken. Website. Sponsor of Website, Date Posted. Web.Date Accessed. <webaddress>.
Salvagnin, Domenico. Flowers. 30 July 2005. Flickr. Yahoo!, n.d. Web. 28 Feb. 2012. <http://www.flickr.com/photos/dominiqs/137546658/>.
Look in JSTOR for the article: "Racial Violence During Reconstruction"