Paisarn Larpsomboonchai,  The Applications of Toyota Production System to Reduce Wastes in Agricultural Products Packing Process: A Study of Onion Packing Plant.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2015, vol. 101(5). 1626 - 1633
    [viewed 19 February 2020]. Available from: https://publications.waset.org/pdf/10001418.