Speed, Attorney General James. Opinion on the Constitutional Power of the Military to Try and Execute the Assassins of the President. Published by the Government Printing Office, Washington, 1865-07-01, Item 1, Box: 5, Folder: 135. Dwight B. Waldo Lincoln Collection, RH-A-3651. Western Michigan University Archives & Regional History Collections. https://aspace.library.wmich.edu/repositories/3/archival_objects/31419 Accessed May 06, 2024.