Piter Nizu Kekry, B. and Fahmi, M. 2021. Economic Facts Of Sumatra And Kalimantan Islands For 10 Years. Jurnal Sosial Teknologi. 1, 11 (Nov. 2021), 1.437–1.443. DOI:https://doi.org/10.59188/jurnalsostech.v1i11.235.