MLA

Kissinger, Henry, 1923-2023. Conference of National Security Professors, Ohio State University, May 17-18, 1963 (declined). Box 251, folder 28. 1963 March-April. https://collections.library.yale.edu/catalog/11786564.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 251, folder 28"])(1963 March-April)[Conference of National Security Professors, Ohio State University, May 17-18, 1963 (declined)]. https://collections.library.yale.edu/catalog/11786564.