Sinaga, S. R., Sidabutar, H. dan Aritonang, E. (2021) “DIFFERENCES OF STUDENT LEARNING OUTCOMES AND ABILITY TO DELIVER INFORMATION ON PICTURE AND PICTURE AND INSIDE OUTSIDE CIRCLE LEARNING MODEL ON VIRUSES”, Jurnal Pelita Pendidikan, 9(1). doi: 10.24114/jpp.v9i1.21505.