Lots of great suggestions so far.
Not necessarily a "definitive" version, but the recording that was my introduction to this tune was on a Bud Shank album from the '70s on Concord called "Heritage". Has "Stella", "Another You", "What Is This Thing..." and other common standards.
Also, when I'm learning a new standard, I usually look for some vocal versions to get a feel for the phrasing of the lyrics. As jazz vocalists go, Ella is a good choice, because she tends to stay pretty close to the original tune in the first statement of the melody."