F. O. Igoche, 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”, AJMBR, vol. 6, no. 1, pp. 120–128, Oct. 2022.