Umagap, Wirda A.Z. “KERAGAMAN SPESIES LANDAK LAUT (Echinoidea) FILUM ECHINODERMATA BERDASAR MORFOLOGI DI PERAIRAN DOFA KABUPATEN KEPULAUAN SULA”. JURNAL BIOEDUKASI 1, no. 2 (Maret 19, 2013): 94–100. Diakses Juli 12, 2026. https://ejournal.xternate.com/index.php/bioedu/article/view/4345.