Bazán Valque, R. Y. ., Mori Ramírez, P. O. ., Cacho Revilla , A. and Polo Escobar, B. R. . (2022) “Strategic plan to improve the quality of customer service in the university adult training program, Chachapoyas, Perú”, Centro Sur, 4(3). Available at: https://centrosureditorial.com/index.php/revista/article/view/233 (Accessed: 9 November 2026).