Subchan, W., and M. T. Safirin. “nalisis ualitas ayanan plikasi uangguru engan -ervqual an et romoter core (NPS)”. imits: ournal of athematics and ts pplications, vol. 22, no. 2, July 2025, pp. 125-34, doi:10.12962/limits.v22i2.4364.