MLA

Ficke, Arthur Davison, 1883-1945. "Abraca/dabra": typescript, original, signed. Box 42, folder 1305. 1939 Mar 13. https://collections.library.yale.edu/catalog/17419048.

APA, 6th edition

Ficke, Arthur Davison, 1883-1945. (["Box 42, folder 1305"])(1939 Mar 13)["Abraca/dabra": typescript, original, signed]. https://collections.library.yale.edu/catalog/17419048.