MLA

Wilson, Edmund, 1895-1972. Muchnic, Helen. Box 48, folder 1305-1313. 1949-65. https://collections.library.yale.edu/catalog/17083230.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 48, folder 1305-1313"])(1949-65)[Muchnic, Helen]. https://collections.library.yale.edu/catalog/17083230.