“IMPROVING CONSUMER SATISFACTION BY INTEGRATING ON SERVICE QUALITY AND LEAN SIX SIGMA METHODS”, JTOM, vol. 12, no. 2, pp. 25–34, Dec. 2017, Accessed: Nov. 10, 2025. [Online]. Available: https://www.educationmalaysia.co.uk/index.php/jtom/article/view/jtom2017.12.2.4