MLA

Wilson, Edmund, 1895-1972. Allilueva, Svetlana. Box 174, folder 4327. 1968, n.d.. https://collections.library.yale.edu/catalog/17083256.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 174, folder 4327"])(1968, n.d.)[Allilueva, Svetlana]. https://collections.library.yale.edu/catalog/17083256.