Choong, S. H., K. K. Foo, H. J. Tang, and M. L. Lai. “Effectiveness of Abacus Hoop© Prototype on Primary School Students’ Mathematics Achievement”. Environment-Behaviour Proceedings Journal, vol. 10, no. SI43, Dec. 2025, pp. 3-8, doi:10.21834/e-bpj.v10iSI43.7719.