MLA
Lockwood, John, 1825 or 1826-1901. Our campaign around Gettysburg : being a memorial of what was endured, suffered, and accomplished by the Twenty-third Regiment (N.Y.S.N.G.) and other regiments associated with them, in their Pennsylvania and Maryland campaign, during the rebel invasion of the loyal states in June-July, 1863. 1864. Regimental Histories. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0924b8gznj-cor.
APA, 6th edition
Lockwood, John, 1825 or 1826-1901. (1864)[Our campaign around Gettysburg : being a memorial of what was endured, suffered, and accomplished by the Twenty-third Regiment (N.Y.S.N.G.) and other regiments associated with them, in their Pennsylvania and Maryland campaign, during the rebel invasion of the loyal states in June-July, 1863]. Regimental Histories, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0924b8gznj-cor.
Chicago
Lockwood, John, 1825 or 1826-1901, Our campaign around Gettysburg : being a memorial of what was endured, suffered, and accomplished by the Twenty-third Regiment (N.Y.S.N.G.) and other regiments associated with them, in their Pennsylvania and Maryland campaign, during the rebel invasion of the loyal states in June-July, 1863, 1864, Regimental Histories, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0924b8gznj-cor.