Mustofa RF, Luthfiani N, Diella D. The Effect of Whatsapp-Based Blended Problem-Based Learning on Students’ Scientific Argument Ability in the Concept of Viruses. rajar [Internet]. 2023 Feb. 21 [cited 2024 Nov. 24];9(2):97-101. Available from: http://rajournals.in/index.php/rajar/article/view/1107