MLA

Thayer, Scofield, 1889-1982. Harvard Monthly editors. Box 74, folder 1948. 1913. https://collections.library.yale.edu/catalog/17142344.

APA, 6th edition

Thayer, Scofield, 1889-1982. (["Box 74, folder 1948"])(1913)[Harvard Monthly editors]. https://collections.library.yale.edu/catalog/17142344.