Sandmo, Agnar (2008). "Pigouvian taxes," The New Palgrave Dictionary of Economics, 2nd Edition. Abstract. 23 Eylül 2015 tarihinde Wayback Machine sitesinde arşivlendi.
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Sandmo, Agnar (2008). "Pigouvian taxes," The New Palgrave Dictionary of Economics, 2nd Edition. Abstract. 23 Eylül 2015 tarihinde Wayback Machine sitesinde arşivlendi.