MLA

Hodgson, Ralph, 1871-1962. Correspondence. Box 20, folder 402-406. 1970-74. https://collections.library.yale.edu/catalog/10259982.

APA, 6th edition

Hodgson, Ralph, 1871-1962. (["Box 20, folder 402-406"])(1970-74)[Correspondence]. https://collections.library.yale.edu/catalog/10259982.