Sari, Nurhaty.
" THE USAGE OF ENVIRONMENT TO INCREASE THE STUDENTS ACHIEVEMENT IN NATURAL SCIENCE SUBJECT FOR THE   5th GRADE STUDENTS OF PEMBANGUNAN PRIVATE  ELEMENTARY SCHOOL TANJUNG MORAWA TAHUN PELAJARAN 2009/2010." <em>SIMBIOSA</em> [Online], 3.1 (2014): n. pag. Web. 14 Feb. 2026