NYT - http://www.nytimes.com/2015/03/06/us/ringling-brothers-circus-dropping-elephants-from-act.html
Huff-Po - http://www.huffingtonpost.com/2015/03/05/ringling-bros-elephants_n_6807340.html
Money - http://money.cnn.com/2015/03/05/news/ringling-bros-circus-elephants/

The story of Topsy
PETA: Video shows abuse of circus elephants - http://www.msnbc.msn.com/id/32103936/ns/us_news-life/
Circus Elephant Training Abuse by Trainers - http://animalrights.about.com/od/animalsinentertainment/a/JaynesElephant2.htm