Simeon, Ishaku, et al. “Efficacy of Token Economy -Technique in Reducing Lateness Behaviour Among Primary School Pupils in Kaduna Metopolis, Nigeria”. Journal of Sociology, Psychology and Anthropology in Practice (JSPAP), vol. 7, no. 3, Dec. 2015, pp. 26-37, http://icidr.org.ng/index.php/Jspap/article/view/1657.