http://www.pressreleasebureau.com Online Press Release Distribution Service en Copyright 2007-2010 Press Release Bureau Sun, 31 May 2009 00:00:00 GMT http://www.pressreleasebureau.com/sphr-study-guide-is-the-perfect-answer-of-recession-10390.html Jobs Sun, 31 May 2009 00:00:00 GMT Human resource study guide also teaches labor theory of value - Karl Marx wrote that the value of goods and services is proportional to the amount of labor required to make them.