MLA

Braithwaite, William Stanley, 1878-1962. Phelps, ------. Box 2, folder 59. 1908. https://collections.library.yale.edu/catalog/16753114.

APA, 6th edition

Braithwaite, William Stanley, 1878-1962. (["Box 2, folder 59"])(1908)[Phelps, ------]. https://collections.library.yale.edu/catalog/16753114.