MLA

Williams, William Carlos, 1883-1963. "Verse as Evidence of Thought," delivered at Briarcliff Junior College. Box 62, folder 1331. 1945 November 29. https://collections.library.yale.edu/catalog/17049606.

APA, 6th edition

Williams, William Carlos, 1883-1963. (["Box 62, folder 1331"])(1945 November 29)["Verse as Evidence of Thought," delivered at Briarcliff Junior College]. https://collections.library.yale.edu/catalog/17049606.