Cite

Anonymous. "Konstern Flyger I Luften." No source, 1934. In Danish. [5487-1]

MLA

Marinetti, F. T., 1876-1944. Anonymous. "Konstern Flyger I Luften." No source, 1934. In Danish. [5487-1]. box 69, slide 67. 1934. https://collections.library.yale.edu/catalog/10657354.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 69, slide 67"])(1934)[Anonymous. "Konstern Flyger I Luften." No source, 1934. In Danish. [5487-1]]. https://collections.library.yale.edu/catalog/10657354.