Sakti, R.H. and Sukardi, S. 2021. Computer Based Instruction (CBI)-flipped classroom development in learning: The experts’ validity. Jurnal Pembangunan Pendidikan: Fondasi dan Aplikasi. 9, 1 (Oct. 2021), 75–81. DOI:https://doi.org/10.21831/jppfa.v9i1.37322.