MLA

Gabo, Naum, 1890-1977. Sweeney, James Johnson. Box 25. 1939-1980. https://collections.library.yale.edu/catalog/17170359.

APA, 6th edition

Gabo, Naum, 1890-1977. (["Box 25"])(1939-1980)[Sweeney, James Johnson]. https://collections.library.yale.edu/catalog/17170359.