Ng, K. L., and S. Samsudin. “Determining the Validity and Reliability of ArtSci-S.P.D. Module On Year 5 Human Circulatory System”. Journal of Learning Theory and Methodology, vol. 5, no. 3, Dec. 2024, pp. 123-8, doi:10.17309/jltm.2024.5.3.05.