Nakashima, Keiko, et al. “Factors Affecting Customer’s Perception of Service Quality: Comparing Differences Among Countries - Case Study: Beauty Salons in Bandung and Tokyo”. The Asian Journal of Technology Management (AJTM), vol. 3, no. 2, Dec. 2010, https://journal.sbm.itb.ac.id/index.php/ajtm/article/view/167.