MLA

Bryher, 1894-1983. Bryher. Box 103, folder 3736-3775. 1896-77, n.d.. https://collections.library.yale.edu/catalog/2013610.

APA, 6th edition

Bryher, 1894-1983. (["Box 103, folder 3736-3775"])(1896-77, n.d.)[Bryher]. https://collections.library.yale.edu/catalog/2013610.