Matulessy, Yoin, Ali Awan, and Sintje Liline. 2021. “The Density of Siasia (Sipunculus Nodus) Population Based on the Differences in the Substrate of the Sea Grasses Beds on the Waters of Saparua Island”. BIOEDUPAT: Pattimura Journal of Biology and Learning 1 (1), 11-16. https://doi.org/10.30598/bioedupat.v1.i1.pp11-16.