Sonatina is a short usually simplified sonata. As a musical term, sonatina has no single strict definition; it is rather a title applied by the composer to a piece that is in basic sonata form, but is shorter and lighter in character, or technically more elementary, than a typical sonata.
Sonatina, sheet music:
Sonatina in D minor (Yuri Shchurovsky)
Sonatina Piccolo (Yuri Shchurovsky)
SONATINA in A minor (Isaak Yakovich Berkovich)
SONATINA (Isaak Yakovich Berkovich)
Two Sonatinas (George Frideric Handel)
LITTLE SONATINA (Villem Reimann)
SONATINA Part-I (L. Miklashevskii)
SONATINE part III (August Eberhard Müller)
SONATINE Mit Trauermarsch Werk 157 (Fritz Spindler)
SONATINA IN G MAJOR OP. 168, NO. 6 FRAGMENT (Anton Diabelli)
SONATINA in B-flat major HWV 585 (George Frideric Handel)
SONATINA IN G MINOR, OP. 84, NO. 2 (Erkki Melartin)