Referencias
Marji, M. (2014). Learn to program with Scratch: A visual introduction to programming with games, art, science, and math.)
Badger, M. (2014). Scratch 2.0 Beginner's Guide Second Edition. Packt Publishing Ltd.
Armoni, M., & Ben-Ari, M. (2010). Computer science concepts in scratch. Rehovot, Israel: Weizmann Institute of Science.