Sari, Pertapa, W Wiyadi, and S Soepatini. “The Influence Of Promotions And Service Quality On Customer Satisfaction At Assalaam Sukoharjo High School”. Ittishal Educational Research Journal 5, no. 1 (September 3, 2024): 39–57. Accessed October 27, 2025. https://www.journal.ittishal.net/index.php/ierj/article/view/69.