1. NORML. National Organization for the Reform of Marijuana Laws 2018.
2. U.S. Census Bureau. American Community Survey. American Fact Finder 2017.
3. Initiative 502. The Washington Marijuana Legalization and Regulation 2012.
4. Washington State Liquor and Cannabis Board. Marijuana License Applicants Alcohol Off‐Premises Licensees Alcohol On‐Premises Licensees 2018. Available at:https://lcb.wa.gov/records/frequently-requested-lists(accessed 6 March 2018).
5. Municipal Research and Services Center. Marijuana Regulation in Washington State 2018. Available at:http://mrsc.org/getdoc/8cd49386-c1bb-46f9-a3c8-2f462dcb576b/Marijuana-Regulation-in-Washington-State.aspx(accessed 15 August 2018).