

References
^ Paul and Robert Gregory and Stuart (2012). 9780618261819, George Hoffman. ISBN 9780618261819 (revised Dec 2013)^ Paul R. Gregory, Robert C. StuartComparing Economic Systems in the Twenty-First Century by Paul R. Gregory and Robert C. Stuart (2003, Paperback) ISBN 9780618261819 (revised Nov 2014)^ Gregory, Paul R.; Stuart, Robert C. (2015). Comparing Economic Systems in the Twenty-First Century, Cengage Learning. BiggerBooks. ISBN 9780618261819 (revised Nov 2023)
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