1. ABC News, 1988. ABC News Poll [All drugs should be illegal?] USABC.091388.R19. Roper Center for Public Opinion Research, iPOLL, Accessed 4 January 2017, Cornell University, Ithaca, NY.
2. CBS News, 1994. CBS News Poll [Some people feel that current drug laws haven't worked, and that drugs like marijuana, cocaine, and heroin should be legalized and subject to government regulation and taxation like alcohol and tobacco. Do you think drug legalization is a good idea or a bad idea?] USCBS.080394.R02. Roper Center for Public Opinion Research, iPOLL, Accessed 4 January 2017, Cornell University, Ithaca, NY.
3. Determinants of public support for marijuana legalization in Uruguay, the United States, and El Salvador;Cruz;J. Drug Issues,2016
4. Gallup Organization, 1939. Gallup Poll [If the question of national prohibition should come up again, would you vote to make the country dry?] USGALLUP.180A.QA01. Roper Center for Public Opinion Research, iPOLL, Accessed 4 January 2017, Cornell University, Ithaca, NY.
5. Gallup Organization, 1984. Gallup Poll (AIPO) [Would you favor or oppose a law forbidding the sale of all beer, wine and liquor throughout the nation?] USGALLUP.1237.Q08. Roper Center for Public Opinion Research, iPOLL, Accessed 4 January 2017, Cornell University, Ithaca, NY.