All Classes: The Jazz Language, by Dan Hearle
Real Easy Book Level 1 (3 horn edition) in C, Bb, Eb, B Cl, by Sher Music Co.
Essential Elements of Jazz in C, Bb, Eb, B Cl, by Mike Steinel, Hal Leonard Pub.
Intermediate and Advanced Classes:
The Real Book 6th Edition, Hal Leonard Pub., $40 in C, Eb, Bb, B, Cl.
Practic Apps, iReal Pro, OS, iOS, Android