Sumner, C. (1863). Our foreign relations: Showing present perils from England and France, the nature and conditions of intervention by mediation, and also by recognition, the impossibility of any recognition of a new power with slavery as a corner-stone, and the wrongful concession of ocean belligerency : speech of Hon. Charles Sumner, before the citizens of New York, at the Cooper Institute, Sept. 10, 1863. Boston: Wright & Potter.

Sumner, Charles. Our Foreign Relations: Showing Present Perils From England and France, the Nature and Conditions of Intervention By Mediation, and Also By Recognition, the Impossibility of Any Recognition of a New Power With Slavery As a Corner-stone, and the Wrongful Concession of Ocean Belligerency : Speech of Hon. Charles Sumner, Before the Citizens of New York, At the Cooper Institute, Sept. 10, 1863. Boston: Wright & Potter, 1863.

Sumner, Charles. Our Foreign Relations: Showing Present Perils From England and France, the Nature and Conditions of Intervention By Mediation, and Also By Recognition, the Impossibility of Any Recognition of a New Power With Slavery As a Corner-stone, and the Wrongful Concession of Ocean Belligerency : Speech of Hon. Charles Sumner, Before the Citizens of New York, At the Cooper Institute, Sept. 10, 1863. Boston: Wright & Potter, 1863.