[Bound collection]
MLA
Horn, Charles Edward, 1786-1849, Horn, Charles Frederick, 1762-1830. [Bound collection]. Box 868. 1809, undated. https://collections.library.yale.edu/catalog/10000249.
APA, 6th edition
Horn, Charles Edward, 1786-1849, & Horn, Charles Frederick, 1762-1830. (["Box 868"])(1809, undated)[[Bound collection]]. https://collections.library.yale.edu/catalog/10000249.