WASET
    Raj Kumar Rajak and  Bharat Mishra,  Studies on the Feasibility of Cow’s Urine as Non-Conventional Energy Sources.   journal   = {International Journal of Energy and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2018, vol. 137(5). 372 - 375
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10008958.