MLA
Benson, Edwin N. (Edwin North). History of the First Regiment Infantry, National Guard of Pennsylvania. 1880. Regimental Histories. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8708w9gp7k-cor.
APA, 6th edition
Benson, Edwin N. (Edwin North). (1880)[History of the First Regiment Infantry, National Guard of Pennsylvania]. Regimental Histories, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8708w9gp7k-cor.
Chicago
Benson, Edwin N. (Edwin North), History of the First Regiment Infantry, National Guard of Pennsylvania, 1880, Regimental Histories, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8708w9gp7k-cor.