None of my real books have it. Honestly, though - listen to Bobby Darrin's version; in the first couple of verses, the bass doesn't walk and it's a simple matter to hear the changes.
Ah - sometimes a few seconds on google will give faster results than posting to a forum like this. Of course, learning the song of the record will give better results, but who wants to take the time to do it yourself? In any case, go to
http://www.congruentmusic.com/charts...he%20Knife.pdf and you'll see at something that should get you started....
While I'm thinking about it, I did NOT read through and check that score for accuracy - and in fact, 'accurate' is a misnomer - the changes that Ella's band did in Berlin aren't really the same changes as Bobby Darrin's version, and Louis Armstrong's version is different from either. You really don't need to know a bass line - you need to know the changes to the song (those are very different concepts). Once you know the changes, you can make up whatever bass line you want.