MLA

Freeman, Walter, 1895-1972. 345. 1916 Delta Kappa Epsilon crew: Pratt, Rinehart, Guernsey, Roberts, Wilson, Otis, Titus, Black. 1, folder 33. 1912-1916. https://collections.library.yale.edu/catalog/10172284.

APA, 6th edition

Freeman, Walter, 1895-1972. (["1, folder 33"])(1912-1916)[345. 1916 Delta Kappa Epsilon crew: Pratt, Rinehart, Guernsey, Roberts, Wilson, Otis, Titus, Black]. https://collections.library.yale.edu/catalog/10172284.