Wikipedia - http://en.wikipedia.org/wiki/Homo_habilis
Archeology Info - http://www.archaeologyinfo.com/homohabilis.htm
MS University - https://www.msu.edu/~heslipst/contents/ANP440/habilis.htm
BBC - http://www.bbc.co.uk/science/cavemen/factfiles/homo_habilis.shtml
Britannica - http://www.britannica.com/EBchecked/topic/270419/Homo-habilis