MLA

Lees-Milne, James, 1908-1997. Tewksbury. Box 27, folder 1019. [ca. 1940s]. https://collections.library.yale.edu/catalog/2007228.

APA, 6th edition

Lees-Milne, James, 1908-1997. (["Box 27, folder 1019"])([ca. 1940s])[Tewksbury]. https://collections.library.yale.edu/catalog/2007228.