MLA

Clésinger-Sand, Solange, 1828-1899. Villa Malgrétout material. Box 6, folder 172. 1870 June 29. https://collections.library.yale.edu/catalog/17444519.

APA, 6th edition

Clésinger-Sand, Solange, 1828-1899. (["Box 6, folder 172"])(1870 June 29)[Villa Malgrétout material]. https://collections.library.yale.edu/catalog/17444519.