Cite

"Papers found in Matthiessen's bureau drawers, 1950 August 16"

MLA

Matthiessen, F. O. (Francis Otto), 1902-1950. "Papers found in Matthiessen's bureau drawers, 1950 August 16". Box 9. undated. https://collections.library.yale.edu/catalog/16883922.

APA, 6th edition

Matthiessen, F. O. (Francis Otto), 1902-1950. (["Box 9"])(undated)["Papers found in Matthiessen's bureau drawers, 1950 August 16"]. https://collections.library.yale.edu/catalog/16883922.