MLA

Bryher, 1894-1983. Pearson, Norman Holmes. Box 41, folder 1496-1514. 1938-53. https://collections.library.yale.edu/catalog/10081058.

APA, 6th edition

Bryher, 1894-1983. (["Box 41, folder 1496-1514"])(1938-53)[Pearson, Norman Holmes]. https://collections.library.yale.edu/catalog/10081058.