MLA

Bryher, 1894-1983. Pearson, Norman Holmes. Box 46, folder 1663-1703. 1970-73. https://collections.library.yale.edu/catalog/10155928.

APA, 6th edition

Bryher, 1894-1983. (["Box 46, folder 1663-1703"])(1970-73)[Pearson, Norman Holmes]. https://collections.library.yale.edu/catalog/10155928.