A. Eman Mohammed,  Modeling Cost Structure for Assessment Production Cost of Algal - Biofue.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2012, vol. 63(3). 650 - 657
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/657.