Samudro, A., Sumarwan, U., Yusuf, E. Z., & Simanjuntak, M. (2018). Perceived Quality and Relationship Quality as Antecedents and Predictors of Loyalty in the Chemical Industry: A Literature Review. European Scientific Journal, ESJ, 14(28), 173. https://doi.org/10.19044/esj.2018.v14n28p173