WASET
    Watchara Surawong and  Cheema Soralumn,  Life Cycle Assessment of Expressway Passenger Transport Service: A Case Study of Thailand.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2014, vol. 93(9). 690 - 698
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10000043.