MLA

Cornell, Julien D., 1910-. Laughlin, James. Box 1, folder 18. 1947 Jan-Feb. https://collections.library.yale.edu/catalog/17207725.

APA, 6th edition

Cornell, Julien D., 1910-. (["Box 1, folder 18"])(1947 Jan-Feb)[Laughlin, James]. https://collections.library.yale.edu/catalog/17207725.