Panitchaikul, P., and T. Chankoson. “Guideline on the Development of Service Quality Pearl-Milk-Tea Entrepreneur for Generation Y Consumers in Bangkok”. Rajamangala University of Technology Tawan-Ok Social Science Journal, vol. 9, no. 1, June 2020, pp. 78-87, https://so05.tci-thaijo.org/index.php/SocialJournal2rmutto/article/view/243883.