MLA

Lockwood, Samuel, 1803-1893. Supplies. Box 2, folder 20. 1838-1839. https://collections.library.yale.edu/catalog/32529442.

APA, 6th edition

Lockwood, Samuel, 1803-1893. (["Box 2, folder 20"])(1838-1839)[Supplies]. https://collections.library.yale.edu/catalog/32529442.