http://www.volcanodiscovery.com/indonesia/sumatra.html
http://en.wikipedia.org/wiki/List_of_volcanoes_in_Indonesia
http://www.thejakartapost.com/news/2013/11/18/indonesias-sinabung-and-merapi-volcanoes-erupt.html
https://www.google.ca/search?q=sumatra+volocanos&oq=sumatra+volocanos&aqs=chrome..69i57.1485j0j1&sourceid=chrome&ie=UTF-8
http://www.redorbit.com/news/science/1113004815/mount-sinabung-eruptions-disrupt-crops-villages-111513
https://www.google.ca/search?q=sumatra+volocano&oq=sumatra+volocano&aqs=chrome..69i57.8268j0j1&sourceid=chrome&ie=UTF-8
https://www.google.ca/search?q=sumatra+volocano&oq=sumatra+volocano&aqs=chrome..69i57.8268j0j1&sourceid=chrome&ie=UTF-8#q=sumatra+volcano+2013&safe=off