MLA

Thayer, Scofield, 1889-1982. "When fresh, it was sweet," typescript and revised typescript. Box 27, folder 704-705. n.d.. https://collections.library.yale.edu/catalog/17142308.

APA, 6th edition

Thayer, Scofield, 1889-1982. (["Box 27, folder 704-705"])(n.d.)["When fresh, it was sweet," typescript and revised typescript]. https://collections.library.yale.edu/catalog/17142308.