Siska Merrydian, Indah Mustika Rini, Wardani Rahayu, and Riyadi. “Systematic Literature Review: Validitas Internal Dan Eksternal Dalam Desain Ekperimen”. EduInovasi:  Journal of Basic Educational Studies, vol. 4, no. 3, Sept. 2024, pp. 987-1001, doi:10.47467/edu.v4i3.2734.