MLA

Van Vechten, Carl, 1880-1964. Robeson, Paul. Box 102 | Folder 1851. 1933 June 1. https://collections.library.yale.edu/catalog/2011747.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 102 | Folder 1851"])(1933 June 1)[Robeson, Paul]. https://collections.library.yale.edu/catalog/2011747.