MLA

Rudge, Olga, 1895-1996. Baynes, Louise to Teddy Rudge. Box 14, folder 547. 1936 Jun-Aug. https://collections.library.yale.edu/catalog/17082122.

APA, 6th edition

Rudge, Olga, 1895-1996. (["Box 14, folder 547"])(1936 Jun-Aug)[Baynes, Louise to Teddy Rudge]. https://collections.library.yale.edu/catalog/17082122.