MLA

Davis, Andrew Jackson, 1826-1910. 1850. Box 1, folder 3. 1848-1929. https://collections.library.yale.edu/catalog/32528450.

APA, 6th edition

Davis, Andrew Jackson, 1826-1910. (["Box 1, folder 3"])(1848-1929)[1850]. https://collections.library.yale.edu/catalog/32528450.