I will follow suit with my title and make a short blog.
The chords for measures 11-13 are:
I hear the notes as a Cm7 instead of Eb as the book says.
I7 or V7/IV
V65 with b7
This pop piece puts me in a good mood being so short. The last two chords give a short of ta-dah feel to me. The ending chord has a jazzy feel with the C, but you might not here that as a jazzy tonic, but a Cm7. The Eb and Bb help the tonic feeling. Leading into it the Bmajor 7 definetly gives the jazz feel. In the jazzy feel the second to last chord gives it a sliding feel to the last chord.
Now on to the finishing touches to LEIDERKRIES OP.39.