Langsa, M. H. “POLYCYCLIC AROMATIC HYDROCARBONS (PAHs) AS BIOMARKERS FOR ASSESSING BIODEGRADATION SUSCEPTIBILITIES OF CRUDE OIL SPILLED ON SOILS”. Jurnal Natural, Vol. 7, no. 1, Apr. 2008, pp. 33 -8, https://jurnalnatural.unipa.ac.id/index.php/jn/article/view/73.