MLA

Lynes, George Platt, 1907-1955. Datebook. Box 2, folder 14. 1951. https://collections.library.yale.edu/catalog/17156220.

APA, 6th edition

Lynes, George Platt, 1907-1955. (["Box 2, folder 14"])(1951)[Datebook]. https://collections.library.yale.edu/catalog/17156220.