Sarakarn , P., P. Siewchaisakul, P. Pramual, N. Putthanachote, and D. Jumparway. “Analysis of Covariance (ANCOVA): Optimal Method for Analyzing Pre-post Data with Repeated Measures Two Groups under Experimental Design in Health Science Research”. Health Science Journal of Thailand, vol. 6, no. 1, Jan. 2024, pp. 42-51, doi:10.55164/hsjt.v6i1.262258.