"IV," notebook
MLA
Wat, Aleksander, 1900-1967. "IV," notebook. Box 33, folder 760. undated. https://collections.library.yale.edu/catalog/2054632.
APA, 6th edition
Wat, Aleksander, 1900-1967. (["Box 33, folder 760"])(undated)["IV," notebook]. https://collections.library.yale.edu/catalog/2054632.