MLA

Anderson, Margaret C., 1886-1973. Solano, Solita. Box 21, folder 374-378. 1915-1970. https://collections.library.yale.edu/catalog/2020074.

APA, 6th edition

Anderson, Margaret C., 1886-1973. (["Box 21, folder 374-378"])(1915-1970)[Solano, Solita]. https://collections.library.yale.edu/catalog/2020074.