MLA

Davis, Andrew Jackson, 1826-1910. 1851. Box 1, folder 4. 1848-1929. https://collections.library.yale.edu/catalog/32528477.

APA, 6th edition

Davis, Andrew Jackson, 1826-1910. (["Box 1, folder 4"])(1848-1929)[1851]. https://collections.library.yale.edu/catalog/32528477.