Teknowijoyo, Felixtian, Sunardi Sunardi, and Gunarhadi Gunarhadi. “Analysis of Student Needs on the Development of Google Classroom-Based Digital Teaching Materials in Physics Subjects for Class VIII of Kalam Kudus Christian Middle School, Surakarta”. International Journal of English Literature and Social Sciences (IJELS) 5, no. 4 (August 31, 2020). Accessed July 22, 2024. https://journal-repository.com/index.php/ijels/article/view/2405.