SARI, Nurhaty Purnama.
 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.
<strong>SIMBIOSA</strong>, [S.l.], v. 3, n. 1, july 2014.
ISSN 2598-6007.
Available at: &lt;<a href="https://www.journal.unrika.ac.id/index.php/simbiosajournal/article/view/253" target="_new">https://www.journal.unrika.ac.id/index.php/simbiosajournal/article/view/253</a>&gt;. Date accessed: 14 feb. 2026.
doi: <a href="https://doi.org/10.33373/sim-bio.v3i1.253">https://doi.org/10.33373/sim-bio.v3i1.253</a>.