MLA
Flynn, Frank J. "The Fighting Ninth" for Fifty Years and the Semi-Centennial Celebration. [publisher not identified], 1911. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6386hdrd1c-cor.
APA, 6th edition
Flynn, F. J. (1911). "The Fighting Ninth" for fifty years and the semi-centennial celebration [Regimental histories.]. [publisher not identified]; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6386hdrd1c-cor.
Chicago
Flynn, Frank J. “‘The Fighting Ninth’ for Fifty Years and the Semi-Centennial Celebration.” Regimental histories. Regimental Histories. [Mass.?]: [publisher not identified], 1911. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6386hdrd1c-cor.