- [GradeSaver](https://www.gradesaver.com/the-wonderful-wizard-of-oz/)
- [CliffsNotes](https://www.cliffsnotes.com/literature/w/the-wonderful-wizard-of-oz/book-summary)
- [Britannica](https://www.britannica.com/summary/The-Wonderful-Wizard-of-Oz-novel-by-Baum)
- [Wikipédia](https://en.wikipedia.org/wiki/The_Wonderful_Wizard_of_Oz)