MLA

Brady, Mathew B., approximately 1823-1896. Military railroad operations in northern Virginia, Men using levers for loosening rails. Box 67, folder 3099. circa 1840-circa 1940. https://collections.library.yale.edu/catalog/2065241.

APA, 6th edition

Brady, Mathew B., approximately 1823-1896. (["Box 67, folder 3099"])(circa 1840-circa 1940)[Military railroad operations in northern Virginia, Men using levers for loosening rails]. https://collections.library.yale.edu/catalog/2065241.