MLA
Christian, Royal A. (Royal Augustus), 1875-1964. Roy's trip to the battlefields of Europe : being the diary of Royal A. Christian.. 1919. African American Imprints Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6558cz8zg2-cor.
APA, 6th edition
Christian, Royal A. (Royal Augustus), 1875-1964. (1919)[Roy's trip to the battlefields of Europe : being the diary of Royal A. Christian.]. African American Imprints Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6558cz8zg2-cor.
Chicago
Christian, Royal A. (Royal Augustus), 1875-1964, Roy's trip to the battlefields of Europe : being the diary of Royal A. Christian., 1919, African American Imprints Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6558cz8zg2-cor.