MLA

Bryher, 1894-1983. Pearson, Norman Holmes. Box 43, folder 1557-1594. 1960-64. https://collections.library.yale.edu/catalog/10086169.

APA, 6th edition

Bryher, 1894-1983. (["Box 43, folder 1557-1594"])(1960-64)[Pearson, Norman Holmes]. https://collections.library.yale.edu/catalog/10086169.