Tembang, Y. dan Purwanty, R. 2021. Outdoor Based Ecosystem Learning during the Covid Pandemic 19 Merauke Elementary School Students. Jurnal Ilmiah Sekolah Dasar. 4, 4 (Mar 2021), 524–535. DOI:https://doi.org/10.23887/jisd.v4i4.29141.