WASET
    O. Boonklong and  M. Jaroensutasinee and  K. Jaroensutasinee,  Computation of D8 Flow Line at Ron Phibun Area, Nakhon Si Thammarat, Thailand.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2007, vol. 9(9). 103 - 106
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/14328.