Pratiwi, L. A., and L. C. Nawangsari. “Organizational Citizenship Behavior While Mediating Self-Efficacy, Servant Leadership and Organization Culture on Employee Performance”. European Journal of Business and Management Research, vol. 6, no. 1, Feb. 2021, pp. 225-31, doi:10.24018/ejbmr.2021.6.1.713.