MLA

Sykes, Christopher, 1907-1986. Sykes visit to Mottisfont, Seaford, and Badlingham. Box 33, folder 404-407. 1948. https://collections.library.yale.edu/catalog/2040355.

APA, 6th edition

Sykes, Christopher, 1907-1986. (["Box 33, folder 404-407"])(1948)[Sykes visit to Mottisfont, Seaford, and Badlingham]. https://collections.library.yale.edu/catalog/2040355.