MLA

Wat, Aleksander, 1900-1967. Zahorska, Stefania. Box 6, folder 257-259. 1956-1960. https://collections.library.yale.edu/catalog/17478180.

APA, 6th edition

Wat, Aleksander, 1900-1967. (["Box 6, folder 257-259"])(1956-1960)[Zahorska, Stefania]. https://collections.library.yale.edu/catalog/17478180.