Except where expressly noted otherwise, the contents of this course are based on materials published in the Open Course Library by Linda Overstreet. These materials were originally published freely under a Creative Commons Attribution License (you can review the license at http://creativecommons.org/licenses/by/3.0/). The original version of the materials as published as Psyc 200 Lifespan Development may be accessed for free at http://opencourselibrary.org/econ-201/.