MLA

Anderson, Margaret C., 1886-1973. Leblanc, Georgette. Box 20, folder 364-367. 1897-1932, undated. https://collections.library.yale.edu/catalog/2020076.

APA, 6th edition

Anderson, Margaret C., 1886-1973. (["Box 20, folder 364-367"])(1897-1932, undated)[Leblanc, Georgette]. https://collections.library.yale.edu/catalog/2020076.