Invisible ink :
spycraft of the American Revolution /
John A. Nagy.
APA Citation
Nagy, J. A. (2010). Invisible ink: spycraft of the American Revolution. Yardley, Pa.: Westholme.
MLA Citation
Nagy, John A. Invisible Ink: Spycraft of the American Revolution. Yardley, Pa.: Westholme, 2010.
Warning: These citations may not always be complete (especially for serials).