MLA

Camp, Walter, 1859-1925. Football games: Yale, unidentified. Box 63, folder 28-29 | reel 46U. undated. https://collections.library.yale.edu/catalog/10011996.

APA, 6th edition

Camp, Walter, 1859-1925. (["Box 63, folder 28-29 | reel 46U"])(undated)[Football games: Yale, unidentified]. https://collections.library.yale.edu/catalog/10011996.