Arrahma, S., and Suendri. “Implementation of Query Optimization Methods in a Web-Based Point of Sale System at Toko Eci Dolok”. JITSI : Jurnal Ilmiah Teknologi Sistem Informasi, Vol. 6, no. 3, Sept. 2025, pp. 274 -85, doi:10.62527/jitsi.6.3.501.