Cite

Popkin, Percy

MLA

Douglas, Norman, 1868-1952. Popkin, Percy. Box 45. 1943-1951, undated. https://collections.library.yale.edu/catalog/16454754.

APA, 6th edition

Douglas, Norman, 1868-1952. (["Box 45"])(1943-1951, undated)[Popkin, Percy]. https://collections.library.yale.edu/catalog/16454754.