Kristiani, Enny, Ujang Sumarwan, Lilik Noor Yuliati, and Asep Saefuddin. 2014. “The Role of Relational Reward Benefits for Developing the Non-Financial Value of a Customer to an Organization: Structural Equation Modeling Approach”. Gadjah Mada International Journal of Business 16 (2), 111-42. https://journal.ugm.ac.id/v3/gamaijb/article/view/15464.