Oren, L., Tziner, A., Nahshon, Y., & Sharoni, G. (2013). Relations between ocbs, organizational justice, work motivation and selfefficacy. Amfiteatru Economic, 15(34), 505-516. https://doi. org/10.1016/j.pestbp.2011.02.012.Investigation
John, A. G., Francis, A. I., & Chukwu, I. I. (2012). Improving Sales Performance through Sales Force Motivation Strategies: A Study of Pharmaceutical Firms in Nigeria. International Journal of Business and Economics Research, 3(5), 1–15.