Oil Prices and Supplies in the Wake of the Persian Gulf Crisis: Hearings Before the Committee on Governmental Affairs, United States Senate, One Hundred First Congress, Second Session; October 25, 1990, Price and Supply of Winter Heating Fuels and Gasoline; October 31, 1990, OPEC and Alternative Sources of Oil; November 1, 1990, The Role of Futures Markets in Oil Pricing, Volume 4