& G. Olorede, S. B. J. O. “Effects of Separate and Combined Chronic Ingestion of Tramadol and Codeine on Aggressive Behaviour Among Female Albino Rats”. Covenant International Journal of Psychology, vol. 5, no. 1, June 2020, https://journals.covenantuniversity.edu.ng/index.php/cijp/article/view/2100.