1. The Nicomachean Ethics;Aristotle,1897
2. Value in informational capitalism and on the Internet;Arvidsson;Inf. Soc.,2012
3. The Medieval Theories of the Just Price: Romanists, Canonists, and Theologians in the 12th and 13th Centuries;Baldwin,1959
4. The Political Economy of Peer Production;Bauwens,2005