WASET
    Yananda Siraphatthada,  Initiative Strategies on How to Increasing Value Add of the Recycling Business.   journal   = {International Journal of Industrial and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 85(1). 157 - 161
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/9997216.