MLA

Gabo, Naum, 1890-1977. Gabo drawing. Box 49. 1955-1977. https://collections.library.yale.edu/catalog/16634421.

APA, 6th edition

Gabo, Naum, 1890-1977. (["Box 49"])(1955-1977)[Gabo drawing]. https://collections.library.yale.edu/catalog/16634421.