MLA

Bryher, 1894-1983. Pearson, Norman Holmes. Box 47, folder 1704-1729. 1973-75, n.d.. https://collections.library.yale.edu/catalog/10167475.

APA, 6th edition

Bryher, 1894-1983. (["Box 47, folder 1704-1729"])(1973-75, n.d.)[Pearson, Norman Holmes]. https://collections.library.yale.edu/catalog/10167475.