1. Grand View Research. (2019, August). Vending machine market size, share & trends analysis report by application (offices, commercial places), by payment mode (cashless, cash), by region (MEA, APAC, North America), and segment forecasts, 2019–2025. Retrieved from : https://www.grandviewresearch.com/industry-analysis/global-vending-machine-market
2. Fact.MR. (2020, May). Vending machines market forecast, trend analysis & competition tracking - Global market insights 2020 to 2030. Retrieved from: https://www.factmr.com/report/4807/vending-machines-market
3. BusinessWire. (2020, July 22). Global vending machines market growth assessment - Expected to reach $146.6 billion by 2027, from an estimated $134.4 billion in 2020 - ResearchAndMarkets.com. Retrieved from: https://www.businesswire.com/news/home/20200722005591/en/Global-Vending-Machines-Market-Growth-Assessment---Expected-to-Reach-146.6-Billion-by-2027-from-an-Estimated-134.4-Billion-in-2020---ResearchAndMarkets.com
4. COVID-19 and the recovery of the tourism industry
5. Higgins-Desbiolles F. (2020). The “war over tourism”: Challenges to sustainable tourism in the tourism academy after COVID-19. Journal of Sustainable Tourism, early access: AUG 2020.