[1] Teknowijoyo, F. et al. 2020. 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. 5, 4 (2020), 1209–1213. DOI:https://doi.org/10.22161/ijels.54.54.