Batubara, Hendra Saputra, Ambiyar Ambiyar, Syahril Syahril, Fadhilah Fadhilah, and Ronal Watrianthos. 2021. “Sentiment Analysis of Face-to-Face Learning Based on Social Media”. Jurnal Pendidikan Teknologi Kejuruan 4 (3). Padang, Indonesia:102-6. https://doi.org/10.24036/jptk.v4i3.22623.