MLA

Clésinger-Sand, Solange, 1828-1899. Notebooks. Box 4, folder 143-145. undated. https://collections.library.yale.edu/catalog/17444516.

APA, 6th edition

Clésinger-Sand, Solange, 1828-1899. (["Box 4, folder 143-145"])(undated)[Notebooks]. https://collections.library.yale.edu/catalog/17444516.