MLA

Davis, Andrew Jackson, 1826-1910. 1856. Box 1, folder 9. 1848-1929. https://collections.library.yale.edu/catalog/32528548.

APA, 6th edition

Davis, Andrew Jackson, 1826-1910. (["Box 1, folder 9"])(1848-1929)[1856]. https://collections.library.yale.edu/catalog/32528548.