Debby Ayu. “Effect of Distribution Channels and Prices on Consumer Loyalty in SPBU SHELL Perbaungan: Effect of Distribution Channels and Prices on Consumer Loyalty in SPBU SHELL Perbaungan”. Journal of Management Science (JMAS), vol. 3, no. 2, Apr. 2020, pp. 31-37, https://www.exsys.iocspublisher.org/index.php/JMAS/article/view/47.