Nurse and a Spy in the Union Army: http://www.gutenberg.org/ebooks/38497
Civil War Trust on Sarah Emma Edmonds: http://www.civilwar.org/education/history/biographies/sarah-emma-edmonds.html
Eggleston, Larry. Women in the Civil War: Extraordinary Stories of Soldiers, Spies, Nurses, Doctors, Crusaders, and Others. (McFarland and Co., 2003).