Citation 1: http://www.youtube.com/watch?v=DDKazBNzfGQ​



​Citation 2: http://www.youtube.com/watch?v=L9mkSi1ihIM

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Citation 3: http://www.youtube.com/watch?v=9leO28ydyfU



Citation 4: http://www.youtube.com/watch?v=KpNFAEbLcvk​



Citation 5: http://www.youtube.com/watch?v=zowVcREK75I



Citation 6: http://highered.mcgraw-hill.com/sites/0072556781/student_view0/chapter32/animation_quiz_3.html



Citation 7: http://highered.mcgraw-hill.com/sites/0072556781/student_view0/chapter32/animation_quiz_3.html



Citation 8: http://www.youtube.com/watch?v=gXzZAKkhDZg&feature=youtu.be 



Citation 9: http://www.youtube.com/watch?v=mFjGgwBquKA&feature=youtu.be



Citation 10: http://www.youtube.com/watch?v=8hBrex3-45M&feature=youtu.be

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Citation 11: http://www.youtube.com/watch?v=zowVcREK75I&feature=youtu.be



Citation 12: http://www.youtube.com/watch?v=qZVPEYIuujo



Citation 13: ​http://www.youtube.com/watch?feature=player_embedded&v=DhxD6sVQEYc