MLA
Confederate States Army - 31st Virginia Infantry Regiment, Company D; February 28-April 30, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, OP4, Folder 1. https://digital.library.emory.edu/purl/945cc2fs64-cor.
APA, 6th edition
Confederate States Army - 31st Virginia Infantry Regiment, Company D; February 28-April 30, 1863 (OP4, Folder 1). (1863). [Muster rolls]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/945cc2fs64-cor.
Chicago
“Confederate States Army - 31st Virginia Infantry Regiment, Company D; February 28-April 30, 1863.” Muster rolls. Civil War Collection, 1863. OP4, Folder 1. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/945cc2fs64-cor.