Samudro, Andreas, Ujang Sumarwan, Eva Z. Yusuf, and Megawati Simanjuntak. “Perceived Quality and Relationship Quality As Antecedents and Predictors of Loyalty in the Chemical Industry: A Literature Review”. European Scientific Journal, ESJ 14, no. 28 (October 31, 2018): 173. Accessed March 28, 2024. https://eujournal.org/index.php/esj/article/view/11386.