Here are links to the complete online Project Gutenberg texts of works by Johanna Spyri.

::In English::

Cornelli

Erick and Sally

Gritli's Children

Heidi

Mäzli: A Story of the Swiss Valleys

Moni the Goat Boy

Rico and Wiseli*
*Also sometimes titled Rico and Stineli, and How Wiseli was Provided For

Toni, the Little Woodcarver

Uncle Titus & His Visit to the Country

Veronica and Other Friends

What Sami Sings with the Birds

::In German::

Heidi kann brauchen, was es gelernt hat

Heidis Lehr- und Wanderjahre

Heimatlos

Moni der Geissbub

Vom This, der doch etwas wird

Was die Grossmutter gelehrt hat

Wie Wiselis Weg gefunden wird

Wo Gritlis Kinder hingekommen sind