Iqbal, Muhammad Naeem, and Asfa Ashraf. 2017. “Recent Trends in Animal Fats and Oils to Biodiesel Research: Conversion Methods, Technical Challenges and Assessment of Economic and Environmental Impacts”. International Journal of Alternative Fuels and Energy 1 (1):21-22. https://psmjournals.org/index.php/ijafe/article/view/142.