Agboola Theophilus Olumuyiwa. “Effectiveness of Integrated Personnel and Payroll Information System in Addressing Ghost Worker Syndrome in Nigerian Public Sector”. Global Journal of Human-Social Science, vol. 18, no. H2, Jan. 2018, pp. 21-29, https://socialscienceresearch.org/index.php/GJHSS/article/view/2494.