What is the source material, if any, for Sanzoku no Musume Ronja?


As the title says, I'm interested to know where the story for Ronja the
Robber's Daughter came from, and if it has a source, I want to read it.

Is it based on a manga/light novel? Or is it an anime-original story?




It's from a children's fantasy book called [Ronja
Rövardotter](http://en.wikipedia.org/wiki/Ronia_the_Robber%27s_Daughter) (
_Ronia the Robber's Daughter_ ) by Swedish author Astrid Lindgren, first
published in 1981.




It's from a children's fantasy book called [Ronja
Rövardotter](http://en.wikipedia.org/wiki/Ronia_the_Robber%27s_Daughter) (
_Ronia the Robber's Daughter_ ) by Swedish author Astrid Lindgren, first
published in 1981.

