MLA

Bryher, 1894-1983. Diaries. Box 149, folder 5066-5067. n.d.. https://collections.library.yale.edu/catalog/9998413.

APA, 6th edition

Bryher, 1894-1983. (["Box 149, folder 5066-5067"])(n.d.)[Diaries]. https://collections.library.yale.edu/catalog/9998413.