& G. Olorede, S.K. Balogun, J.I. Osuh. 2020. “Effects of Separate and Combined Chronic Ingestion of Tramadol and Codeine on Aggressive Behaviour Among Female Albino Rats”. Covenant International Journal of Psychology 5 (1). https://journals.covenantuniversity.edu.ng/index.php/cijp/article/view/2100.