VAHLEPY, R.; WINARNO, W.; AZIZAH, F.; RINALDI, D. CUSTOMER SATISFACTION ANALYSIS ON SALES ENGINEERING SERVICE USING SERVQUAL AND FACTOR ANALYSIS IN PACKAGING INDUSTRY. BAREKENG: Jurnal Ilmu Matematika dan Terapan, v. 16, n. 2, p. 663-674, 1 jun. 2022.