MLA
McDermott, Anthony W. A Brief History of the 69th Regiment Pennsylvania Veteran Volunteers : from Its Formation until Final Muster out of the United States Service. D.J. Gallagher & Co., printers and publishers, 1889. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6149p8d3n2-cor.
APA, 6th edition
McDermott, A. W. (1889). A brief history of the 69th Regiment Pennsylvania Veteran Volunteers : from its formation until final muster out of the United States service [Regimental histories.]. D.J. Gallagher & Co., printers and publishers; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6149p8d3n2-cor.
Chicago
McDermott, Anthony W. “A Brief History of the 69th Regiment Pennsylvania Veteran Volunteers : from Its Formation until Final Muster out of the United States Service.” Regimental histories. Regimental Histories. Philadelphia: D.J. Gallagher & Co., printers and publishers, 1889. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6149p8d3n2-cor.