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This study aims to examine the antecedents of Organizational Citizenship Behavior and Service Quality. This study used an explanatory research approach, which aims to explain the causal relationship between the research variables and the test hypothesis. The population in this study were all employees from the 5 best private Islamic universities in North Sumatra and the sample size in this study was 200 employees. The data analysis method used in this research is factor analysis and the Structural Equation Model. The results of the study showed that work ethics, organizational commitment and motivation have a significant positive effect on Organizational Citizenship Behavior. Organizational Citizenship Behavior has a significant positive effect on Service Quality at Private Universities in North Sumatra.

The purpose of this study was to determine and analyze the influence of the Mediation Role of Workplace Spirituality on the Effect of Spiritual Leadership on Organizational Citizenship Behavior on Administrative Employees at the State Islamic University of North Sumatra, directly or indirectly. The approach used in this study is a causal approach. The population in this study were all administrative staff at the State Islamic University of North Sumatra. The sample in this study using the slovin formula totaling 66 administrative employees at the State Islamic University of North Sumatra. Data collection techniques in this study used interview techniques, documentation studies, observation, and questionnaires. The data analysis technique in this study uses a quantitative approach using statistical analysis by using the Auter Model Analysis test, Inner Model Analysis, and Hypothesis Testing. Data processing in this study using the PLS (Partial Least Square) software program. The results of this study prove that directly Workplace Spirituality on Spiritual Leadership has a significant effect on Organizational Citizenship Behavior and indirectly Spiritual Leadership has a significant effect on Organizational Citizenship Behavior mediated by Workplace Spirituality on Administrative Employees at the State Islamic University of North Sumatra.

This study aims to examine the factors that influence internet banking customer loyalty in Medan City. The location of this research was carried out at several banks in the city of Medan. The population in this study were all bank customers who use internet banking and the total sample was 175 customers. Researchers used the Structural Equation Modeling assisted by the Lisrel 8.80 program in this research. The results showed that risk perceptions have a negatif and significant effect on customer satisfaction and customer trust. Perception of Privacy has a positive and significant effect on Customer Satisfaction and Customer Trust. Satisfaction has a positive and significant impact on Customer Trust. Perception of risk has a negatif and significant effect on customer loyalty. Perception of Privacy has a positive and insignificant effect on Customer Loyalty. Satisfaction has a positive and significant effect on Customer Loyalty and Trust Has a positive and significant effect on Customer Loyalty. Satisfaction and trust can negatifly mediate the effect of Risk Perception on Customer Loyalty. Satisfaction and trust can positively mediate the effect of Perceptions of Privacy on Customer Loyalty. Trust Satisfaction can positively mediate the effect of satisfaction on Customer Loyalty