APA (7th ed.) Citation

Waller, D. C. (2019). Lincoln's spies: Their secret war to save a nation. Simon & Schuster.

Chicago Style (17th ed.) Citation

Waller, Douglas C. Lincoln's Spies: Their Secret War to Save a Nation. New York: Simon & Schuster, 2019.

MLA (8th ed.) Citation

Waller, Douglas C. Lincoln's Spies: Their Secret War to Save a Nation. Simon & Schuster, 2019.

Warning: These citations may not always be 100% accurate.