CRS Report RL33305, The Crude Oil Windfall Profit Tax of the 1980s: Implications for Current Energy Policy, by Salvatore Lazzari, pp. 5.
בדיקה אחרונה ב-22 בינואר 2011.  CRS Report RL33305, The Crude Oil Windfall Profit Tax of the 1980s: Implications for Current Energy Policy, by Salvatore Lazzari, pp. 5.