WEDGRAFIAS

https://platzi.com/blog/que-es-scrum-y-los-roles-en-scrum/
https://iswugscrumaps2.wordpress.com/historia-3/
https://es.slideshare.net/Ixchel_muffin/scrum-10162115
https://proyectosagiles.org/que-es-scrum/
https://www.youtube.com/watch?v=gX6-px8bmLE
http://www.kzi.mx/la-importancia-del-scrum-master/
http://www.antoniomartel.com/2013/04/estadisticas-de-uso-de-scrum.html