P. Thepnarintra and S. Nikorn, A Study on Fundamental Problems for Small and Medium Agricultural Machinery Industries in Central Region Area. journal = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology. November 2013, vol. 83(11). 2987 - 2991 [viewed 19 September 2024]. Available from: https://publications.waset.org/pdf/10003097.