http://www.simplypsychology.org/vygotsky.html
www.toolsofthemind.org/philosophy/vygotskian-approach/
http://www.learnnc.org/lp/pages/5075
http://www.toolsofthemind.org/philosophy/scaffolding/
http://www.unm.edu/~devalenz/handouts/sociocult.html
http://www.press.umich.edu/pdf/0472030345-ch1.pdf
http://www.sophia.org/tutorials/sociocultural-theory