MLA

Clésinger-Sand, Solange, 1828-1899. Others (family). Box 2, folder 66. 1866-1897, undated. https://collections.library.yale.edu/catalog/17444498.

APA, 6th edition

Clésinger-Sand, Solange, 1828-1899. (["Box 2, folder 66"])(1866-1897, undated)[Others (family)]. https://collections.library.yale.edu/catalog/17444498.