WASET
    Sougata Bardhan and  Yona Chen and  Warren A. Dick,  Recycling for Sustainability: Plant Growth Media from Coal Combustion Products, Biosolids and Compost.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2009, vol. 27(3). 149 - 155
    [viewed 04 May 2024]. Available from: https://publications.waset.org/pdf/12778.