http://repository.uhamka.ac.id/id/eprint/12688/ Implementation of Online Learning during the Covid 19 Pandemic on Psychological Development of Grade 4 Students Febriani, Annisa Varian http://repository.uhamka.ac.id/id/eprint/12688/1/11_A_2021_Article_Psychology_Educatio_Annisa_Puri.pdf Unduh!