Sofwan, Ridho Dimas, et al. “Analysis of Customer Satisfaction Using the Modified Servqual Method (Case Study at Waroeng Spesial Sambal Ss): Analisis Kepuasan Konsumen Menggunakan Metode Modified Servqual (Studi Kasus Di Waroeng Spesial Sambal Ss)”. PROZIMA (Productivity, Optimization and Manufacturing System Engineering), vol. 3, no. 2, Mar. 2021, pp. 21-30, doi:10.21070/prozima.v3i2.1271.