MLA
Circular, Confederate States of America, War Department : Regulations of Subsistence Department Other than Those Already Printed in Army Regulations, with Date of Order ... [publisher not identified], 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24298sfbnf-cor.
APA, 6th edition
Circular, Confederate States of America, War Department : Regulations of subsistence department other than those already printed in army regulations, with date of order ... (1863). [publisher not identified]; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24298sfbnf-cor.
Chicago
“Circular, Confederate States of America, War Department : Regulations of Subsistence Department Other than Those Already Printed in Army Regulations, with Date of Order ...” Civil War Imprints. Richmond: [publisher not identified], 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24298sfbnf-cor.