MLA
Union Patriotic Envelope - "Then Conquer We Must, for Our Cause It Is Just, And This Be Our Motto, 'In God Is Our Trust,' And the Star-Spangled Banner in Triumph Shall Wave O'Er the Land of the Free and the Home of the Brave.". 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 21, Folder 7. https://digital.library.emory.edu/purl/99351c5c5m-cor.
APA, 6th edition
Union patriotic envelope - "Then conquer we must, for our cause it is just, And this be our motto, 'In God is our trust,' And the Star-Spangled banner in triumph shall wave O'er the land of the free and the home of the brave." (Box 21, Folder 7). (1861). [Envelopes]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/99351c5c5m-cor.
Chicago
“Union Patriotic Envelope - ‘Then Conquer We Must, for Our Cause It Is Just, And This Be Our Motto, 'In God Is Our Trust,' And the Star-Spangled Banner in Triumph Shall Wave O'Er the Land of the Free and the Home of the Brave.".” Envelopes. Civil War Collection, 1861. Box 21, Folder 7. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/99351c5c5m-cor.