MLA

Smith, Joel Sumner, 1830-. Miscellaneous. Box 1, folder 6 - 7. Circa 1881-1902, undated. https://collections.library.yale.edu/catalog/10015845.

APA, 6th edition

Smith, Joel Sumner, 1830-. (["Box 1, folder 6 - 7"])(Circa 1881-1902, undated)[Miscellaneous]. https://collections.library.yale.edu/catalog/10015845.