MLA

Anderson, Margaret C., 1886-1973. Diary writings. Box 25, folder 411. circa 1933. https://collections.library.yale.edu/catalog/17099463.

APA, 6th edition

Anderson, Margaret C., 1886-1973. (["Box 25, folder 411"])(circa 1933)[Diary writings]. https://collections.library.yale.edu/catalog/17099463.