Bibliographie

Nous avons utilisé pour nos recherches :

 https://www.youtube.com/watch?v=8cupwT-FxKE

https://www.youtube.com/watch?v=7a1y5l4dbz8

 https://www.youtube.com/watch?v=n0C1FyC0kzY

http://images.google.fr/imgres?imgurl=http%3A%2F%2Fimage.slidesharecdn.com%2Fcitationsimages-nature-160526083243%2F95%2Fcitations-images-nature-10-638.jpg%3Fcb%3D1464251594&imgrefurl=http%3A%2F%2Fwww.slideshare.net%2Fhelenaaldaz%2Fcitations-images-nature&h=479&w=638&tbnid=5xYnFbMEYDYSMM%3A&vet=1&docid=n5-Fy6vcZRPVmM&ei=KxNyWNDBNMiBUa-hoNAJ&tbm=isch&client=firefox-b&iact=rc&uact=3&dur=231&page=3&start=73&ndsp=26&ved=0ahUKEwiQg6CoqrLRAhXIQBQKHa8QCJoQMwh-KF8wXw&bih=701&biw=1525