Ugwu, P. A., K. A. Opuware, and O. S. Ambakederemo. “Application of Statistical Tools for Data Analysis: Relationship Technique”. International Scholar Journal of Arts and Social Science Research, vol. 4, no. 2, May 2021, pp. 354-6, https://theinterscholar.org/journals/index.php/isjassr/article/view/126.