Rafdinal, R. (2022) “Analysis of Lead (Pb) Heavy Metal Content in Tengkuyung Snail (Cerithidea obtuse) and Sediment in the Kuala Mangrove Area of Singkawang City”, Jurnal Biologi Tropis, 22(4), pp. 1378–1383. doi: 10.29303/jbt.v22i4.4403.