Source: US. Bureau of the Census
Release: State Government Tax Collections
For more information, see http://www.census.gov/govs/www/statetax.html.
US. Bureau of the Census, State Government Tax Collections, Motor Vehicle Operators Licenses in Oklahoma [OKMVOPERTAX], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/OKMVOPERTAX, October 24, 2016.