MLA

Lewis, Jon, 1938-2009. Picketing IV. Box 4, folder 29. 1966. https://collections.library.yale.edu/catalog/10186967.

APA, 6th edition

Lewis, Jon, 1938-2009. (["Box 4, folder 29"])(1966)[Picketing IV]. https://collections.library.yale.edu/catalog/10186967.