MLA

Basso, Hamilton, 1904-1964. Article on Brazil: notes. Box 19, folder 332-33. 1947, n.d.. https://collections.library.yale.edu/catalog/17209153.

APA, 6th edition

Basso, Hamilton, 1904-1964. (["Box 19, folder 332-33"])(1947, n.d.)[Article on Brazil: notes]. https://collections.library.yale.edu/catalog/17209153.