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L. Smith (1927– ). The Concise Encyclopedia of Economics. Library of Economics and Liberty 2nd (Liberty Fund). 2008 [2018-12-23]. （原始内容存档于2008-12-21）
Encyclopedia of Economics（英语：The Concise Encyclopedia of Economics）. Library of Economics and Liberty（英语：Library of Economics and Liberty） 2nd (Liberty Fund（英语：Liberty
價格信號
Boudreaux, Donald J. Information and Prices. The Concise Encyclopedia of Economics. Library of Economics and Liberty (econlib.org). [18 June 2017]. （原始内容存档于2017-06-19）
Political Economy and Taxation （页面存档备份，存于互联网档案馆）, by David Ricardo. Complete, fully searchable text at the Library of Economics and Liberty. Ricardo on Value:
勞倫斯·克萊因
Robert Klein (1920– ). The Concise Encyclopedia of Economics. Library of Economics and Liberty 2nd (Liberty Fund). 2008 [2013-10-24]. （原始内容存档于2014-07-10）.