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2. The replicability of cannabis use prevalence estimates in the United States;Alshaarawy;International Journal of Methods in Psychiatric Research,2017
3. American Association of Public Opinion Research (AAPOR), (2010). Report on online panels. From https://www.aapor.org/Education-Resources/Reports/Report-on-Online-Panels.
4. American Association of Public Opinion Research (AAPOR). (2019). Online panels. From https://www.aapor.org/Education-Resources/Election-Polling-Resources/Online-Panels.aspx.
5. National estimates of marijuana use and related indicators—National Survey on Drug Use and Health, United States, 2002–2014;Azofeifa;Morbidity and Mortality Weekly Report: Surveillance Summaries,2016