Alianto, Alianto, et al. “Perbedaan Hasil Belajar Kognitif Siswa Pada Pembelajaran Daring Melalui Google Classroom Dan Whatsapp Mesenger Di SMP Negeri 4 Bengkulu Tengah: (Differences in Student Cognitive Learning Outcomes in Online Learning Through Google Classroom and Whatsapp Messenger at SMP Negeri 4 Bengkulu Tengah)”. BIODIK, vol. 7, no. 4, Dec. 2021, pp. 10-17, doi:10.22437/bio.v7i4.13565.