MLA

Wat, Aleksander, 1900-1967. Drawings. Box 39, folder 847-851. 1960s, undated. https://collections.library.yale.edu/catalog/16569886.

APA, 6th edition

Wat, Aleksander, 1900-1967. (["Box 39, folder 847-851"])(1960s, undated)[Drawings]. https://collections.library.yale.edu/catalog/16569886.