WASET
    Kamolchanok Panishkan and  Kanokporn Swangjang and  Natdhera Sanmanee and  Daoroong Sungthong,  Principal Component Analysis for the Characterization in the Application of Some Soil Properties.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2012, vol. 65(5). 279 - 281
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/2959.