MLA

Van Thal, Herbert, 1904-1983. Lytton, Victor Alexander George Robert Bulwer-Lytton, Earl. Box 1, folder 78. 1939-47. https://collections.library.yale.edu/catalog/16545982.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 1, folder 78"])(1939-47)[Lytton, Victor Alexander George Robert Bulwer-Lytton, Earl]. https://collections.library.yale.edu/catalog/16545982.