MLA

Bryher, 1894-1983. Macpherson, Kenneth. Box 35, folder 1281. [1928]-30. https://collections.library.yale.edu/catalog/10187067.

APA, 6th edition

Bryher, 1894-1983. (["Box 35, folder 1281"])([1928]-30)[Macpherson, Kenneth]. https://collections.library.yale.edu/catalog/10187067.