MLA

Kissinger, Henry, 1923-2023. Proceedings of Sixth Pugwash Conference, Moscow, USSR, November 27-December 5, 1960. Box 108, folder 2. 1961 February. https://collections.library.yale.edu/catalog/11784237.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 108, folder 2"])(1961 February)[Proceedings of Sixth Pugwash Conference, Moscow, USSR, November 27-December 5, 1960]. https://collections.library.yale.edu/catalog/11784237.