MLA

Clésinger-Sand, Solange, 1828-1899. Guerin, René. Box 1, folder 36. [1852?] November 24. https://collections.library.yale.edu/catalog/17444469.

APA, 6th edition

Clésinger-Sand, Solange, 1828-1899. (["Box 1, folder 36"])([1852?] November 24)[Guerin, René]. https://collections.library.yale.edu/catalog/17444469.