MLA

Clésinger-Sand, Solange, 1828-1899. Troubat, Jules. Box 2, folder 61. 1876. https://collections.library.yale.edu/catalog/17444493.

APA, 6th edition

Clésinger-Sand, Solange, 1828-1899. (["Box 2, folder 61"])(1876)[Troubat, Jules]. https://collections.library.yale.edu/catalog/17444493.