Mustofa, Romy Faisal, Ninda Luthfiani, and Dea Diella. “The Effect of Whatsapp-Based Blended Problem-Based Learning on Students’ Scientific Argument Ability in the Concept of Viruses”. RA Journal of Applied Research 9, no. 2 (February 21, 2023): 97–101. Accessed April 4, 2025. http://rajournals.in/index.php/rajar/article/view/1107.