MLA

Gabo, Naum, 1890-1977. The Structurist, Saskatoon, Canada. Box 25. 1939-1980. https://collections.library.yale.edu/catalog/2055188.

APA, 6th edition

Gabo, Naum, 1890-1977. (["Box 25"])(1939-1980)[The Structurist, Saskatoon, Canada]. https://collections.library.yale.edu/catalog/2055188.