MLA

Thayer, Scofield, 1889-1982. Schnitzler, Arthur. Box 39, folder 1112-1113. 1921-25. https://collections.library.yale.edu/catalog/17142322.

APA, 6th edition

Thayer, Scofield, 1889-1982. (["Box 39, folder 1112-1113"])(1921-25)[Schnitzler, Arthur]. https://collections.library.yale.edu/catalog/17142322.