Goh, Francine W, Alexandria C Jungck, and Jeffrey R Stevens. “Pro Tip: Screen-Based Payment Methods Increase Negative Feelings in Consumers But Do Not Increase Tip Sizes”. European Journal of Behavioral Sciences 4, no. 4 (December 20, 2021): 1–21. Accessed October 8, 2025. https://www.dpublication.com/journal/EJBS/article/view/678.