MLA

Clésinger-Sand, Solange, 1828-1899. Calmann-Lévy (Firm). Box 1, folder 15. 1874-1878. https://collections.library.yale.edu/catalog/17444454.

APA, 6th edition

Clésinger-Sand, Solange, 1828-1899. (["Box 1, folder 15"])(1874-1878)[Calmann-Lévy (Firm)]. https://collections.library.yale.edu/catalog/17444454.