Article on Confederate treatment of prisoners from New York Times, October 2, 1864 (via ProQuest Historical Newspapers database)
Article on Andersonville prison from the Charleston Mercury, August 26, 1864 (via Accessible Archives database)
The BU Libraries have many books, both in print and online, that contain exhibit sources about the Civil War. A few examples are shown below, but you can also click on these links to browse for more:
Regulations for the government of Negroes and plantation. 3 February 1864, GLC08446, © The Gilder Lehrman Institute of American History (Via American History, 1493-1945)
Here's how to search this collection:
[Reports sent from Decatur, Georgia], 1 Oct 1863 - 6 Jul 1864, © Briscoe Center for American History, The University of Texas at Austin (Via Medical Services and Warfare Collection database)
Here's how to search this collection: