https://www.pausacaffeblog.it/wp/2016/12/le-stelle-arte.html
https://www.elapsus.it/2008/12/tra-arte-e-astronomia-le-stelle-di-van.html
https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.mlkmuggio.gov.it/sites/default/files/risorse-didattiche/5d-spazio-appunti.pdf&ved=2ahUKEwjN6tC436rmAhUCzKQKHXjmA8kQFjACegQICBAE&usg=AOvVaw2FStp8JsMoR5i-FMRyeMHM
