MLA

Van Thal, Herbert, 1904-1983. Cockerell, Sydney Carlyle, Sir. Box 1, folder 24. 1949. https://collections.library.yale.edu/catalog/16545928.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 1, folder 24"])(1949)[Cockerell, Sydney Carlyle, Sir]. https://collections.library.yale.edu/catalog/16545928.