SagalaS. L., BramawantoR., KuswardaniA. R., and PranowoW. S. “DISTRIBUTION OF HEAVY METALS IN NATUNA COASTAL WATERS”. Jurnal Ilmu Dan Teknologi Kelautan Tropis, Vol. 6, no. 2, Feb. 2015, doi:10.29244/jitkt.v6i2.9008.