Umanah, I.A. et al. 2025. Assessment of Heavy Metal and Polycyclic Aromatic Hydrocarbon (PAH) Levels in Drilling Fluids and Effluents from Niger Delta Oil Fields. Researchers Journal of Science and Technology. 5, 3 (Apr. 2025), 22–40. DOI:https://doi.org/10.83080/rejost.vol5no3.179.