Mengist Hailemariam and  Silma Yoseph,  Improving Production Capacity through Efficient PPC System: Lesson from Leather Manufacturing.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2015, vol. 98(2). 354 - 359
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10000929.