Talk:3 Sonatinas, Op.137 (Schubert, Franz)
Free public domain sheet music from IMSLP / Petrucci Music Library
I think those sonatinas should be called "Sonatas".
Schubert wrote the word "Sonata" in the heading of every manuscript of these pieces. It was Diabelli who -probabily in the hope of increasing sales- gave them the title of "Sonatinen".