But her document had no title. The napkin just had scribbles. And the "source"? A bar that closed in 2008.

Desperate, she scrolled to Section 8.7: Unpublished and Informally Published Works. The rule stated: Cite as [number] “Author(s), year, ‘title of document,’ unpublished, source (if any), location.”

She typed:

On it, Tanaka had sketched a stress-strain curve and written six lines of data.