Siska Merrydian, Indah Mustika Rini, Wardani Rahayu and Riyadi (2024) “Systematic Literature Review: Validitas Internal dan Eksternal dalam Desain Ekperimen”, EduInovasi:  Journal of Basic Educational Studies, 4(3), pp. 987–1001. doi: 10.47467/edu.v4i3.2734.