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National History -http://science.nationalgeographic.com/science/space/universe/supernovae-article.html

NASA Goddard Space Flight Center-http://imagine.gsfc.nasa.gov/docs/science/know_l1/dwarfs.html

Universe Today-http://www.universetoday.com/24720/red-giant-star/

The Web Nebulae-http://astro.nineplanets.org/twn/types.html

Protostar-http://sunshine.chpc.utah.edu/labs/star_life/starlife_proto.html