Igoche, F. O., G. S. Sani, J. M. Jerry, J. A. Mabadeje, and A. L. Umar. “Outsourcing Cleaning Services As an Alternative to In-House Cleaning in an Organization: A Case Study of the Bank of Agriculture (BOA), Bauchi Plaza”. African Journal of Management and Business Research, vol. 6, no. 1, Oct. 2022, pp. 120-8, https://publications.afropolitanjournals.com/index.php/ajmbr/article/view/222.