MLA

Keller, Deane, 1901-1992. "Cosimo" [return of Cosimo di Medici equestrian statue to Florence]. Box 27, folder 96 - 98. 1940-1960 (inclusive), 1943-1946 (bulk). https://collections.library.yale.edu/catalog/10015664.

APA, 6th edition

Keller, Deane, 1901-1992. (["Box 27, folder 96 - 98"])(1940-1960 (inclusive), 1943-1946 (bulk))["Cosimo" [return of Cosimo di Medici equestrian statue to Florence]]. https://collections.library.yale.edu/catalog/10015664.