MLA

Gabo, Naum, 1890-1977. Einstein, Albert. Box 8. 1939-1980. https://collections.library.yale.edu/catalog/17170355.

APA, 6th edition

Gabo, Naum, 1890-1977. (["Box 8"])(1939-1980)[Einstein, Albert]. https://collections.library.yale.edu/catalog/17170355.