MLA

Beckford, William, 1760-1844. Franchi, L. (with pencil notes by Beckford and typescript copy with translation). Box 4, folder 68. 1822 Feb 24. https://collections.library.yale.edu/catalog/17453928.

APA, 6th edition

Beckford, William, 1760-1844. (["Box 4, folder 68"])(1822 Feb 24)[Franchi, L. (with pencil notes by Beckford and typescript copy with translation)]. https://collections.library.yale.edu/catalog/17453928.