Abdullah Salem Bin Ghouth, et al. “Prevalence of Child Labor Among Elementary School Students from 5 Th to 9 Th Grade in Al Mukalla”. Global Journal of Human-Social Science, vol. 18, no. H6, Mar. 2018, pp. 1-5, https://socialscienceresearch.org/index.php/GJHSS/article/view/2665.