MLA
Army of the Potomac : History of Its Campaigns, the Peninsula, Maryland, Fredericksburg : Testimony of Its Three Commanders, Maj.-Gen. G.B. McClellan, Maj.-Gen. A.E. Burnside, and Maj.-Gen. Joseph Hooker, before the Congressional Committee on the Conduct of the War. Tribune Association, 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1439zw3vqr-cor.
APA, 6th edition
Army of the Potomac : history of its campaigns, the Peninsula, Maryland, Fredericksburg : testimony of its three commanders, Maj.-Gen. G.B. McClellan, Maj.-Gen. A.E. Burnside, and Maj.-Gen. Joseph Hooker, before the Congressional Committee on the Conduct of the War. (1863). [Regimental histories.]. Tribune Association; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1439zw3vqr-cor.
Chicago
“Army of the Potomac : History of Its Campaigns, the Peninsula, Maryland, Fredericksburg : Testimony of Its Three Commanders, Maj.-Gen. G.B. McClellan, Maj.-Gen. A.E. Burnside, and Maj.-Gen. Joseph Hooker, before the Congressional Committee on the Conduct of the War.” Regimental histories. Regimental Histories. New York: Tribune Association, 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1439zw3vqr-cor.