LINKS DE VIDEOS DE ELABORACION Y USO DE FÉRULAS

- http://www.youtube.com/watch?v=0y6_M3EEt0g

- http://www.youtube.com/watch?v=_rj7-wykuYw&feature=related

- http://www.youtube.com/watch?v=_4AB8AQ0UeI&feature=related

- http://www.ecr.edu.co/unlimitpages.asp?id=113

- http://200.26.134.109:8080/endeporte/hermesoft/portal/home_1/rec/arc_2203.pdf