MLA

Kissinger, Henry, 1923-2023. McCaffrey, Barry R.. Box 141, folder 2. 2007 October. https://collections.library.yale.edu/catalog/12479438.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 141, folder 2"])(2007 October)[McCaffrey, Barry R.]. https://collections.library.yale.edu/catalog/12479438.