"The I. O. U.," drafts, autograph manuscript signed and typescript carbon
MLA
"The I. O. U.," Drafts, Autograph Manuscript Signed and Typescript Carbon. 0AD. https://collections.library.yale.edu/catalog/17218664.
APA, 6th edition
"The I. O. U.," drafts, autograph manuscript signed and typescript carbon. (0 C.E.). [Manuscripts, Typescripts]. https://collections.library.yale.edu/catalog/17218664.