Hamzah, Syarifudin. “KEKOSONGAN NORMA DALAM PENGENAAN SERVICE CHARGE DI INDUSTRI RESTORAN : ANALISIS YURIDIS TERHADAP PERLINDUNGAN KONSUMEN””. Jurnal Perspektif Hukum, vol. 7, no. 1, June 2026, pp. 94-105, https://jurnal.harapan.ac.id/index.php/JPH/article/view/1391.