MLA

Cassirer, Ernst, 1874-1945. "Rede zu Verfassungsfeier am 11. August 1928": draft, holograph, corrected (Envelope #122). Box 49, folder 982. 1928 Aug 11. https://collections.library.yale.edu/catalog/17274645.

APA, 6th edition

Cassirer, Ernst, 1874-1945. (["Box 49, folder 982"])(1928 Aug 11)["Rede zu Verfassungsfeier am 11. August 1928": draft, holograph, corrected (Envelope #122)]. https://collections.library.yale.edu/catalog/17274645.