Wilson, Robert, Calvin Kwesi Gafrey, George Amoako, and Benjamin Anderson. “Metallic Composition Analysis of Crude Petroleum from Some Oil Fields in Ghana”. Physical Science International Journal 25, no. 5 (September 14, 2021): 19-29. Accessed October 20, 2021. https://journalpsij.com/index.php/PSIJ/article/view/30256.