Leon Suvitayaawat. (2017) Business plan tractorone : Online marketplace for heavy machinery equipment. Stamford International University:ม.ป.ท.Leon Suvitayaawat. 2017. Business plan tractorone : Online marketplace for heavy machinery equipment. ม.ป.ท.:Stamford International University;Leon Suvitayaawat. Business plan tractorone : Online marketplace for heavy machinery equipment. ม.ป.ท.:Stamford International University, 2017. Print.