MLA

Wilson, Edmund, 1895-1972. Canby, Margaret. Box 14, folder 339-342. 1928-29. https://collections.library.yale.edu/catalog/17083220.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 14, folder 339-342"])(1928-29)[Canby, Margaret]. https://collections.library.yale.edu/catalog/17083220.