Ojo, O. A. “The Effect of Metacognitive Instructional Strategy on Mathematics Achievement and Retention Among Secondary School Students in Ekiti State, Nigeria”. Journal of Sociology, Psychology and Anthropology in Practice (JSPAP), vol. 8, no. 1, Apr. 2017, pp. 49-61, http://icidr.org.ng/index.php/Jspap/article/view/1665.