MLA

Covarrubias, Miguel, 1904-1957. Covarrubias, Miguel. Box 32 | Folder 417. 1925-1946, undated. https://collections.library.yale.edu/catalog/10000264.

APA, 6th edition

Covarrubias, Miguel, 1904-1957. (["Box 32 | Folder 417"])(1925-1946, undated)[Covarrubias, Miguel]. https://collections.library.yale.edu/catalog/10000264.