MLA

Pratt, Richard Henry, 1840-1924. Marion Pratt Stevick: essay on Manimic. Box 22, folder 722. 1953. https://collections.library.yale.edu/catalog/17104195.

APA, 6th edition

Pratt, Richard Henry, 1840-1924. (["Box 22, folder 722"])(1953)[Marion Pratt Stevick: essay on Manimic]. https://collections.library.yale.edu/catalog/17104195.