Shabrina Pritta Radyanti and  Harimukti Wandebori,  Collaborative Business Strategy of PTT Energy Trading Co. Ltd. for LNG form of Coal Bed Methane in B2B Transaction to Japanese Shareholder, Especially to Electricity and Power Supply Companies.   journal   = {International Journal of Industrial and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2012, vol. 70(10). 2719 - 2723
    [viewed 20 October 2019]. Available from: https://publications.waset.org/pdf/10605.