MLA

Thayer, Scofield, 1889-1982. Wittenberg, Sophia. Box 44, folder 1267-1268. 1920-25. https://collections.library.yale.edu/catalog/17142325.

APA, 6th edition

Thayer, Scofield, 1889-1982. (["Box 44, folder 1267-1268"])(1920-25)[Wittenberg, Sophia]. https://collections.library.yale.edu/catalog/17142325.