Amajida, Abiyyu, Yudik Prasetyo, Enggista Hendriko Delano, and Muhammad Fatih Humam. “Level of Customer Satisfaction on the Service Quality Personal Trainer”. Jurnal Keolahragaan 10, no. 1 (April 25, 2022): 118–126. Accessed May 19, 2025. https://journal.uny.ac.id/index.php/jolahraga/article/view/44898.