MLA

Camp, Walter, 1859-1925. Football games. Box 63, folder 23-27 | reel 46U. undated. https://collections.library.yale.edu/catalog/10012016.

APA, 6th edition

Camp, Walter, 1859-1925. (["Box 63, folder 23-27 | reel 46U"])(undated)[Football games]. https://collections.library.yale.edu/catalog/10012016.