MLA

Camp, Walter, 1859-1925. Football: players. Box 63, folder 30-33 | reel 46U. undated. https://collections.library.yale.edu/catalog/10012032.

APA, 6th edition

Camp, Walter, 1859-1925. (["Box 63, folder 30-33 | reel 46U"])(undated)[Football: players]. https://collections.library.yale.edu/catalog/10012032.