Source: Dow Jones & Company
Release: Wall Street Journal
Prior to 1982 equals the posted price.
Copyright, 2016, Dow Jones & Company
Dow Jones & Company, Spot Oil Price: West Texas Intermediate [OILPRICE], retrieved from ALFRED, Federal Reserve Bank of St. Louis; https://alfred.stlouisfed.org/series?seid=OILPRICE, January 16, 2018.