Shallsuku, Philip. 2018. “Modification and Evaluation of the Potential of Nigerian Bentonite Clays As Catalysts Support for Upgrading Heavy Crude Oil and Bitumen”. Journal of Chemical, Mechanical and Engineering Practices (JCMEP) 7 (1-3):11-38. http://icidr.org.ng/index.php/Jcmep/article/view/1108.