MLA

Pearson, Norman Holmes, 1909-1975. Notebooks. Box 304. circa 1932-1962, undated. https://collections.library.yale.edu/catalog/33551391.

APA, 6th edition

Pearson, Norman Holmes, 1909-1975. (["Box 304"])(circa 1932-1962, undated)[Notebooks]. https://collections.library.yale.edu/catalog/33551391.