Books about Newton Knight and The Free State of Jones.

My particular favorite about the Free State of Jones is:

"The Free State of Jones" by Victoria Bynum. I read it and it is really good. She points out how the pro- and anti-Confederate factions in the country where Knight led his resistance to the Confederacy split along class lines where upscale and slave vested interests supported the Confederacy and ordinary people didn't.

http://www.amazon.com/Free-State-Jones-Mississippis-Longest/dp/0807854670/ref=sr_1_1?ie=UTF8&qid=1420770405&sr=8-1&keywords=Free+State+of+jones


There are also books about other Southerners who didn't support the Confederacy.

There is "Secret Yankees: The Union Circle in Confederate Atlanta" by Thomas G. Dyer.

http://www.amazon.com/Secret-Yankees-Confederate-Atlanta-Society/dp/B008SLEOMI/ref=sr_1_1?s=books&ie=UTF8&qid=1420770691&sr=1-1

A major work on the topic was:

"Lincoln's Loyalists: Union Soldiers from the Confederacy" by Richard Nelson Current.