Putra, Dimas Herlambang, and Iriani Iriani. “Analysis of Service Quality and Customer Satisfaction for Umrah at PT. Allinma Universal Using the Potential Gain in Customer Value Method”. IJIEM - Indonesian Journal of Industrial Engineering and Management, vol. 5, no. 2, Nov. 2024, pp. 339-4, doi:10.22441/ijiem.v5i2.21988.