Definitions, Sources and Explanatory Notes:
Release: Spot Prices
US. Energy Information Administration, Crude Oil Prices: West Texas Intermediate (WTI) - Cushing, Oklahoma [DCOILWTICO], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/DCOILWTICO/, July 7, 2015.
FRED BlogKeep the car running: retail gas sales and prices
FRED BlogDoes the market believe the change in oil prices is permanent?