Abrar Erlangga, Alif Muhammad, Andi Reza Perdanakusuma, and Uun Hariyanti. “Applying Zone of Tolerance to a Customer Service App in a Public Higher Education Institution”. Journal The Winners 26, no. 2 (October 17, 2025): 147–157. Accessed March 17, 2026. https://journal.binus.ac.id/index.php/winners/article/view/13863.