Oladapo, Samuel Olanrewaju. “Knowledge and Perception of Secondary School Teachers on Global Warming in Ibadan Oyo State, Nigeria”. American International Journal of Education and Linguistics Research 2, no. 2 (June 3, 2019): 29-34. Accessed October 26, 2020. https://www.acseusa.org/journal/index.php/aijelr/article/view/84.