MLA

Kissinger, Henry, 1923-2023. Memorandum of conversation with Kurt Birrenbach, Fritz Berg, et al, May 17, 1963. Box 251, folder 26. 1963 May-June. https://collections.library.yale.edu/catalog/11786562.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 251, folder 26"])(1963 May-June)[Memorandum of conversation with Kurt Birrenbach, Fritz Berg, et al, May 17, 1963]. https://collections.library.yale.edu/catalog/11786562.