Nataruma, M.P. et al. 2026. Microplastic Abundance in Water and Sediments in the Opak River Estuary, Bantul, Special Region of Yogyakarta. Journal of Marine Biotechnology and Immunology. 4, 03 (Sep. 2026), 104–111. DOI:https://doi.org/10.61741/JMBI.2026.v4.p104-111.