Arindawan, Dedek, Lambang Subagiyo, and Evie Palenewen. 2021. “The EFFECTIVENESS OF ONLINE OFFLINE LEARNING MEDIA (MO2) BASED ON SMARTPHONE”. IJER - INDONESIAN JOURNAL OF EDUCATIONAL REVIEW 8 (1):15-22. https://journal.unj.ac.id/unj/index.php/ijer/article/view/23250.