MLA

Clésinger-Sand, Solange, 1828-1899. ----, Roger. Box 2, folder 64. 1882. https://collections.library.yale.edu/catalog/17444496.

APA, 6th edition

Clésinger-Sand, Solange, 1828-1899. (["Box 2, folder 64"])(1882)[----, Roger]. https://collections.library.yale.edu/catalog/17444496.