MLA

Bryher, 1894-1983. Chevalley, Freddy. Box 169, folder 5659. 1927-31. https://collections.library.yale.edu/catalog/10172241.

APA, 6th edition

Bryher, 1894-1983. (["Box 169, folder 5659"])(1927-31)[Chevalley, Freddy]. https://collections.library.yale.edu/catalog/10172241.