MLA

Clésinger-Sand, Solange, 1828-1899. Bridoux, ----. Box 1, folder 13. 1893 November 25. https://collections.library.yale.edu/catalog/17444452.

APA, 6th edition

Clésinger-Sand, Solange, 1828-1899. (["Box 1, folder 13"])(1893 November 25)[Bridoux, ----]. https://collections.library.yale.edu/catalog/17444452.