Ramadhoni, Febrina Suci, dan Martina Asiati Napitupulu. 2018. “THE DIFFERENCES OF STUDENTS™ LEARNING ACHIEVEMENT BY POSTER DISPLAYING ON ENVIRONMENT TOPIC GRADE X SMA OF MEDAN”. Jurnal Pelita Pendidikan 6 (3). https://doi.org/10.24114/jpp.v6i3.10779.