MLA

Kissinger, Henry, 1923-2023. Vienna Declaration, Third Pugwash Conference, Kitzbuhel and Vienna, Austria, Sep 14-20, 1958. Box 108, folder 12. 1958 September. https://collections.library.yale.edu/catalog/11784247.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 108, folder 12"])(1958 September)[Vienna Declaration, Third Pugwash Conference, Kitzbuhel and Vienna, Austria, Sep 14-20, 1958]. https://collections.library.yale.edu/catalog/11784247.