"The Challenge Today"
MLA
Kissinger, Henry, 1923-2023. "The Challenge Today". Box 203, folder 16. 1968 April. https://collections.library.yale.edu/catalog/11785919.
APA, 6th edition
Kissinger, Henry, 1923-2023. (["Box 203, folder 16"])(1968 April)["The Challenge Today"]. https://collections.library.yale.edu/catalog/11785919.