Shaukat, Neelofar, Bilal Khan, Taimur Khan, Muhammad Naeem Younis, Najam ul Faris, Aqib Javed, and Muhammad Naeem Iqbal. “A Comprehensive Review of Biogas Sector for Electric Power Generation in Pakistan”. PSM Biological Research 1, no. 1 (May 24, 2016): 43-48. Accessed October 18, 2019. https://journals.psmpublishers.org/index.php/biolres/article/view/23.