MLA

Van Vechten, Carl, 1880-1964. Peterkin, Julia Mood. Box 371 | Folder 5267. 1933 February 26. https://collections.library.yale.edu/catalog/10000644.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 371 | Folder 5267"])(1933 February 26)[Peterkin, Julia Mood]. https://collections.library.yale.edu/catalog/10000644.