MLA

Brady, Mathew B., approximately 1823-1896. Grigsby, Pearl. Box 37, folder 1839. 1849-circa 1956. https://collections.library.yale.edu/catalog/33109407.

APA, 6th edition

Brady, Mathew B., approximately 1823-1896. (["Box 37, folder 1839"])(1849-circa 1956)[Grigsby, Pearl]. https://collections.library.yale.edu/catalog/33109407.