MLA

Baskin, Leonard, 1922-2000. Volume. Box 1, folder 5. circa 1790-1820. https://collections.library.yale.edu/catalog/16601281.

APA, 6th edition

Baskin, Leonard, 1922-2000. (["Box 1, folder 5"])(circa 1790-1820)[Volume]. https://collections.library.yale.edu/catalog/16601281.