MLA

Gabo, Naum, 1890-1977. Foster, Norman. Box 8. 1939-1980. https://collections.library.yale.edu/catalog/16855621.

APA, 6th edition

Gabo, Naum, 1890-1977. (["Box 8"])(1939-1980)[Foster, Norman]. https://collections.library.yale.edu/catalog/16855621.