Correspondence
MLA
Zilboorg, Gregory, 1890-1959. Correspondence. Box 4, folder 51-53. 1931-1940. https://collections.library.yale.edu/catalog/17085345.
APA, 6th edition
Zilboorg, Gregory, 1890-1959. (["Box 4, folder 51-53"])(1931-1940)[Correspondence]. https://collections.library.yale.edu/catalog/17085345.