MLA

Lynes, George Platt, 1907-1955. "My Trip Abroad" diary. Box 1, folder 1. 1925. https://collections.library.yale.edu/catalog/17422356.

APA, 6th edition

Lynes, George Platt, 1907-1955. (["Box 1, folder 1"])(1925)["My Trip Abroad" diary]. https://collections.library.yale.edu/catalog/17422356.