Sydorov, Mykola, Svitlana Salnikova, Yuriy Savelyev, and Oksana Oliinyk. “Modified SERVPERF and Normalized SERVQUAL Models in Estimation of Service Quality in Higher Educational Institutes”. Sociological Studios, no. 1(16) (June 28, 2020): 29–39. Accessed September 24, 2026. https://sociostudios.knu.ua/index.php/socio/article/view/298.