Novalinda, R. et al. 2023. Constructivist Computer-Based Instruction (CBI) Approach: A CBI Flipped Learning Integrated Problem Based and Case Method (PBL-cflip) in Clinical Refraction Course. International Journal of Online and Biomedical Engineering (iJOE). 19, 05 (Apr. 2023), pp. 42–56. DOI:https://doi.org/10.3991/ijoe.v19i05.37707.