MLA

Seymour, George Dudley, 1859-1945. Yale University. Box 72, folder 1065-1069. 1896-1918, undated. https://collections.library.yale.edu/catalog/10015973.

APA, 6th edition

Seymour, George Dudley, 1859-1945. (["Box 72, folder 1065-1069"])(1896-1918, undated)[Yale University]. https://collections.library.yale.edu/catalog/10015973.