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http://carbon.ucdenver.edu/~mryder/itc_data/constructivism.html

http://adulteducation.wikibook.us/index.php?title=Constructivism

http://scholar.lib.vt.edu/ejournals/JVTE/v16n1/doolittle.html

http://www.answers.com/topic/constructivism-learning-theory

http://www.quasar.ualberta.ca/edit573/Links/constructivism.htm

http://en.wikipedia.org/wiki/Constructivism_(learning_theory)

http://www.acjournal.org/holdings/vol5/iss3/special/jones.htm

http://www.education-world.com/teachers/methods/constructivism.shtml

http://www.indiana.edu/~reading/ieo/bibs/cons-ele.html

http://www.indiana.edu/~reading/ieo/bibs/cons-sec.html

http://www.ericdigests.org/1998-1/learning.htm