SUPRAPTO, Sabtanto Joko. Geokimia regional Sulawesi bagian Utara percontoh endapan sungai aktif -80 mesh. Indonesian Journal on Geoscience, [S. l.], v. 1, n. 2, p. 73–82, 2006. DOI: 10.17014/ijog.1.2.73-82. Disponível em: https://ijog.geologi.esdm.go.id/index.php/IJOG/article/view/10. Acesso em: 7 jun. 2025.