1. Tobacco retail policy landscape: a longitudinal survey of US states
2. Counter Tobacco . The war in the store, 2015. Available: https://countertobacco.org/the-war-in-the-store/ [Accessed 23 Apr 2019].
3. Counter Tobacco . FTC Reports Show Tobacco Companies Spent $7.1 Billion at the POS, 2016. Available: https://countertobacco.org/ftc-reports-show-tobacco-companies-spent-7-1-billion-at-the-pos-in-2016/ [Accessed 23 Apr 2019].
4. Truth Initiative . Vaporized: majority of youth exposed to e-cigarette advertising, 2015. Available: https://truthinitiative.org/research-resources/tobacco-industry-marketing/vaporized-majority-youth-exposed-e-cigarette [Accessed 20 Jan 2020].
5. Truth Initiative . Vaporized: youth and young adult exposure to e-cigarette marketing, 2015. Available: https://truthinitiative.org/sites/default/files/media/files/2019/03/Vaporized-Youth-Exposure-To-E-Cigarette-Marketing.pdf [Accessed 26 Jan 2020].