MLA

Van Vechten, Carl, 1880-1964. Albee, Edward. Box 330, folder 4086. 1961 April 18. https://collections.library.yale.edu/catalog/2029466.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 330, folder 4086"])(1961 April 18)[Albee, Edward]. https://collections.library.yale.edu/catalog/2029466.