MLA

Gabo, Naum, 1890-1977. Barooshian, Vahan. Box 2. 1939-1980. https://collections.library.yale.edu/catalog/2055163.

APA, 6th edition

Gabo, Naum, 1890-1977. (["Box 2"])(1939-1980)[Barooshian, Vahan]. https://collections.library.yale.edu/catalog/2055163.