"Manifesto (in the form of a criticism of the works of Gertrude Stein)"
MLA
Williams, William Carlos, 1883-1963. "Manifesto (in the form of a criticism of the works of Gertrude Stein)". Box 43, folder 1077. undated. https://collections.library.yale.edu/catalog/17049582.
APA, 6th edition
Williams, William Carlos, 1883-1963. (["Box 43, folder 1077"])(undated)["Manifesto (in the form of a criticism of the works of Gertrude Stein)"]. https://collections.library.yale.edu/catalog/17049582.