MLA

Ford, Julia Ellsworth, 1859-1950. Canaan, Gilbert. Box 1, folder 13. 1919-1920. https://collections.library.yale.edu/catalog/17167810.

APA, 6th edition

Ford, Julia Ellsworth, 1859-1950. (["Box 1, folder 13"])(1919-1920)[Canaan, Gilbert]. https://collections.library.yale.edu/catalog/17167810.